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29 Cards in this Set
- Front
- Back
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acute angle |
An angle with a measure less than 90 degrees. |
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acute triangle |
A triangle in which each angle is less than 90 degrees (so all the angles in the triangle are acute). |
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base |
The surface the prism stands on, perpendicular to the prism's height. |
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adjacent angles |
Angles that have the same vertex, share a common ray (side), and do not overlap |
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complementary angles |
Two angles with an angle measure that sum up to 90 degrees. |
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congruent |
Having the same measure. |
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coplanar |
Two points or lines that lie on the same plane. |
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cylinder |
A solid figure whose bases are formed by congruent circles in parallel planes. |
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edge |
The intersection of faces of a 3-D figure. |
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equilateral triangle |
A triangle with all 3 sides congruent and all 3 angles congruent. |
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isosceles triangle |
A triangle with at least 2 congruent sides. |
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obtuse angle |
An angle with a measure greater than 90 degrees. |
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obtuse triangle |
A triangle with one obtuse angle. |
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plane |
A 2-D flat surface that extends in all directions. |
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polyhedron |
A solid figure with 4 or more flat surfaces that are polygonal (a simple closed figure in a plane formed by three or more line segments) regions. |
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prism |
A polyhedron figure with 2 parallel congruent faces called bases. Its sides are called congruent faces. |
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pyramid |
A solid figure with a polygon as a base and all sides are triangles. |
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right angle |
An angle with a measure of exactly 90 degrees. |
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right triangle |
A triangle with one right angle. |
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scale |
A ratio or rate between the actual size of an object and the size of its model. |
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scale drawing |
A drawing that is similar to an actual object, but is either reduced or enlarged. |
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scale factor |
A scale written as a ratio in simplest form. |
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scale model |
A replica of an original object that is too small or too large to be built at its actual size. |
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scalene triangle |
A triangle with no congruent sides or angles. |
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straight angle |
An angle with a measure of exactly 180 degrees. |
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supplementary angles |
Two angles with angle measures that add up to 180 degrees. |
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triangle |
A polygon having 3 sides. |
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vertex |
The common endpoint of more than one ray. The point where 3 or more planes intersect. |
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vertical angles |
Opposite angles formed by the intersection of two lines and are congruent to each other. |
