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