Stack #347307
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| acute triangle A triangle in which all three angles are acute | Examples:
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| angle A figure formed by two rays that have a common endpoint | Example:
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| chord A line segment with its endpoints on a circle | Example:
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| circle A closed plane figure with all points on the figure the same distance from the center | Example:
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| circumference The distance around a circle | Example:
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| closed figure A figure that begins and ends at the same point | Examples:
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| cone A solid figure that has a circular base and one vertex | Examples:
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| congruent Having the same size and shape | Example: The triangles are congruent.
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| congruent figures Figures that have the same size and shape | Example: The triangles are congruent.
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| coordinate plane A plane formed by two intersecting and perpendicular number lines called axes | Example:
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| cube A solid figure with six congruent square faces | Examples:
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| cylinder A solid figure that has two parallel bases that are congruent circles | Examples:
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| degree (°) A unit for measuring angles and temperature | Examples:
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| diamete A line segment that passes through the center of a circle and has its endpoints on the circle | Example: diameter
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| dimension A measure in one direction; the length, width, or height of a figure | Example:
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| edge The line segment where two faces of a solid figure meet | Example: edge
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| equilateral triangle A triangle with three congruent sides | Example: face A polygon that is a flat surface of a solid figure
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| face A polygon that is a flat surface of a solid figure | Example: face
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| figurate numbers Numbers that can be represented by geometric figures | Examples:
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| hexagon A polygon with six sides and six angles | Examples:
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| hypotenuse In a right triangle, the side opposite the right angle; the longest side in a right triangle | Example: hypotenuse
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| intersecting lines Lines that cross at exactly one point | Example: Line EF intersects line GH.
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| isosceles triangle A triangle with two congruent sides | Example:
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| line A straight path in a plane that goes on forever in opposite directions | Example: line AB or line BA
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| line segment A part of a line that includes two points, called endpoints, and all of the points between them | Example: line segment AB or line segment BA
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| line symmetry A figure has line symmetry if a line can separate the figure into two congruent parts | Example:
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| obtuse angle An angle whose measure is greater than 90° and less than 180° | Example:
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| obtuse triangle A triangle that has one obtuse angle | Example:
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| octagon A polygon with eight sides | Examples:
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| ordered pair A pair of numbers used to locate a point on a coordinate plane; the first number tells how far to move horizontally and the second number tells how far to move vertically | Example: (1,2) represents 1 unit to the right of zero and 2 units up.
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| parallel lines Lines in a plane that never intersect | Example:
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| parallelogram A quadrilateral whose opposite sides are parallel and congruent | Examples:
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| pentagon A polygon with five sides | Examples:
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| perpendicular lines Two lines that intersect to form four right angles | Example:
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| (noun) The ratio of the circumference of a circle to its diameter An approximate decimal value of pi is 3.14. |
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| plane A flat surface that extends without end in all directions | Example: Planes are named by three points in the plane.
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| plane figure A figure which lies in a plane | Examples:
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| point An exact location in space, usually represented by a dot | Example: point A
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| point symmetry When a figure can be turned half way about a central point and still look the same | Example:
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| polygon A closed plane figure formed by three or more line segments | Examples:
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| polyhedron A solid figure with flat faces that are polygons | Examples:
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| prism A solid figure that has two congruent, polygon-shaped bases, and other faces that are all rectangles | Examples: rectangular prism triangular prism
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| protractor A tool used for measuring or drawing angles | Example:
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| pyramid A solid figure with a polygon base and all other faces triangles that meet at a common vertex | Example: This is a square pyramid.
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| Example: quadrilateral A polygon with four sides | Examples:
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| radius A line segment with one endpoint at the center of a circle and the other endpoint on the circle | Example: radius
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| ray A part of a line, with one endpoint, that continues without end in one direction | Example: ray CD
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| rectangle A parallelogram with four right angles | Example:
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| rectangular prism A solid figure in which all six faces are rectangles | Example:
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| reflection (flip) A movement of a figure to a new position by flipping it over a line | Example:
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| regular polygon A polygon in which all sides are congruent and all angles are congruent | Examples:
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| rhombus A parallelogram with four congruent sides | Example:
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| right angle An angle formed by perpendicular lines, line segments, or rays and with a measure of 90° | Example:
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| right triangle A triangle with one right angle | Example:
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| rotation (turn) A movement of a figure by turning it around a fixed point | Example:
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| rotational symmetry The property of a figure that can be rotated less than 360° around a central point and still be congruent to the original figure | Example:
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| scale drawing A drawing that shows a real object smaller than (a reduction) or larger than (an enlargement) the real object | Example:
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| scalene triangle A triangle with no congruent sides | Example:
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| similar figures Figures with the same size but not shape necessarily the same | Example:
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| solid figure A three-dimensional figure | Examples: sphere cubecylinder rectangularprismcone squarepyramid
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| sphere A solid figure that has the shape of a round ball; all points are the same distance from the center | Example:
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| square A rectangle with 4 equal sides | Example:
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| square pyramid A pyramid with a square base and four triangular faces | Example:
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| tangram A puzzle consisting of seven polygon-shaped pieces that can be rearranged to make various figures or shapes | Example:
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| tessellation An arrangement of closed figures that completely covers a surface with no gaps and no overlaps | Example:
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| three-dimensional Measured in three directions, such as length, width, and height | Example: heightwidth lengthThe rectangular prism is a three-dimensional figure.
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| transformation The movement of a figure by a translation, reflection, or rotation | Examples: translationreflectionrotation
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| translation (slide) A movement of a figure along a straight line | Example:
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| trapezoid A quadrilateral with one pair of parallel sides | Examples:
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| triangle A polygon with three sides | Examples:
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| triangular number A number that can be represented by a triangular array | Examples:
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| two-dimensional Measured in two directions, such as length and width | Example: widthlength
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| vertex The point where two or more rays meet; the point of intersection of two sides of a polygon; the point of intersection of three or more edges of a solid figure; the top point of a cone; the plural of vertex is vertices | Examples:
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| volume The measure of the amount of space a solid figure occupies | Example: The volume of this figure is 24 cubic units.
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| x-axis The horizontal number line on a coordinate plane | Example:
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| x-coordinate The first number in an ordered pair, which tells the distance to move right or left from (0, 0) | Example:
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| y-axis The vertical number line on a coordinate plane | Example:
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| y-coordinate The second number in an ordered pair, it tells the distance to move up or down from (0, 0) | Example:
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| Circumference | C = x d
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| Volume of rectangular prism | V = l x w x h
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| Perimeter of polygon | = sum of lengths of sides
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| Perimeter of rectangle | P = (2 x l) + (2 x w)
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| Perimeter of square | P = 4 x s
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| Area of rectangle | A = l x w
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| Area of parallelogram | A = bh
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| Area of triangle | A = bh
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Or sort by any of the columns using the down arrow next to any column heading.
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Created by:
blakesmith