Geometry Terms
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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A triangle in which all three angles are acute | acute triangle
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A figure formed by two rays that have a common endpoint | Angle
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A line segment with its endpoints on a circle | Chord
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A closed plane figure with all points on the figure the same distance from the center | Circle
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The distance around a circle | Circumference
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A figure that begins and ends at the same point | Closed figure
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A solid figure that has a circular base and one vertex | Cone
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Having the same size and shape | Congruent
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Figures that have the same size and shape | Congruent figures
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A plane formed by two intersecting and perpendicular number lines called axes | Coordinate plane
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The numbers in an ordered pair | Coordinates
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A solid figure with six congruent square faces | Cube
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A solid figure that has two parallel bases that are congruent circles | Cylinder
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A unit for measuring angles and temperature | Degree (°)
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A line segment that passes through the center of a circle and has its endpoints on the circle | Diameter
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A measure in one direction; the length, width, or height of a figure | Dimension
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The line segment where two faces of a solid figure meet | Edge
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A triangle with three congruent sides | Equilateral triangle
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A polygon that is a flat surface of a solid figure | Face
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Numbers that can be represented by geometric figures | Figurate numbers
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A polygon with six sides and six angles | Hexagon
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In a right triangle, the side opposite the right angle; the longest side in a right triangle | Hypotenuse
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Lines that cross at exactly one point | Intersecting lines
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A triangle with two congruent sides | Isosceles triangle
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A straight path in a plane that goes on forever in opposite directions | Line
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A part of a line that includes two points, called endpoints, and all of the points between them | Line segment
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A figure has line symmetry if a line can separate the figure into two congruent parts | Line symmetry
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A triangle that has one obtuse angle | Obtuse triangle
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A polygon with eight sides | Octagon
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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 | Ordered pair
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Lines in a plane that never intersect | Parallel lines
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A quadrilateral whose opposite sides are parallel and congruent | Parallelogram
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A polygon with five sides | Pentagon
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Two lines that intersect to form four right angles | Perpendicular lines
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The ratio of the circumference of a circle to its diameter | pi
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A flat surface that extends without end in all directions | Plane
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A figure which lies in a plane | Plane figure
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An exact location in space, usually represented by a dot | Point
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When a figure can be turned half way about a central point and still look the same | Point symmetry
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A closed plane figure formed by three or more line segments | Polygon
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A solid figure with flat faces that are polygons | Polyhedron
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A solid figure that has two congruent, polygon-shaped bases, and other faces that are all rectangles | Prism
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A tool used for measuring or drawing angles | Protractor
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A solid figure with a polygon base and all other faces triangles that meet at a common vertex | Pyramid
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A polygon with four sides | Quadrilateral
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Created by:
17rcombs
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