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25 Cards in this Set
- Front
- Back
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acute triangle |
a triangle with 3 acute angles |
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auxiliary line |
a line drawn in a figure to aid in a proof |
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base |
the side opposite the vertex angle of a triangle |
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base angle |
one of the 2 angles that have the base of the triangle as a side |
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congruent polygons |
two polygons whose corresponding sides and angles are congruent |
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coordinate proof |
a style of proof that uses coordinate geometry and algebra |
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corollary |
a theorem whose proof follows directly from another theorem |
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corresponding angles |
angles in the same relative position in two different polygons that have the same number of angles |
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corresponding sides |
sides in the same relative position in two different polygons that have the same number of sides |
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CPCTC |
an abbreviation for "Corresponding Parts of Congruent Triangles are Congruent" which can be used as a justification in a proof after 2 triangles are proven congruent |
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equiangular triangle |
a triangle with three congruent angles |
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equilateral triangle |
a triangle with three congruent sides |
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exterior |
the set of all points outside a polygon |
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exterior angle |
an angle formed by one side of a polygon and the extension of an adjacent side |
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included angle |
the angle formed by 2 adjacent sides of a polygon |
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included side |
the common side of 2 consecutive angles of a polygon |
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interior |
the set of all points inside a polygon |
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interior angle |
an angle formed by two sides of a polygon with a common vertex |
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isosceles triangle |
a triangle with at least two congruent sides |
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legs of an isosceles triangle |
one of the 2 congruent sides of the isosceles triangle |
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obtuse triangle |
a triangle with one obtuse angle |
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remote interior angles |
an interior angle of a polygon that is not adjacent to the exterior angle |
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right triangle |
a triangle with one right angle |
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scalene triangle |
a triangle with no congruent sides |
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vertex angle |
the angle formed by the legs of a triangle |
