Ch.4 Geometry
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18 terms
Terms | Definitions |
|---|---|
 triangle | a polygon with three sides |
| scalene | no sides are congruent |
| isoscles | two sides are congruent |
| equilateral | all sides are congruent |
| acute triangle | three acute angles |
| right triangle | one right angle |
| obtuse triangle | one obtuse angles |
| equilangular triangle | three congruent angles |
| triangle sum theorm | the sum of the measures of the interior angles of a triangle is 180 degrees |
| exterior angles theorm | the measure of an exterior angles of a triangle is equal to the sum of the measures of the two nonadjacent interior angles |
| collary to a theorm | a statement that can be proved easily using a theorm |
| collary to the triangle sum theorm | the acute angles of a right angle are complementary |
| third angles congruence theorm | if two angles of one triangle are congruent to two angles of another triangle, then the third angles are congruent |
| SSS congruence postulate | if three sides of one triangle are congruent to three sides of a second triangle, then the two triangles are congruent |
| SAS congruence postulate | If two sides of one triangle are congruent to two sides and the included angle of a second triange, then the triangles are congruent |
| HL congruence postulate | if the hypotenuse and leg of a right triangle are congruent to the hypotenuse and leg of a second right triangle, then the two triangles are congruent |
| ASA congruence postulate | if two angles and the included side of one triangle are congruent to two angles and the included side of a second triangle, then the triangles are congruent |
| AAS congruence theorm | if two angles and the non included side f only riangle are congruent to two angles and the corresponding non included side of a second triange, the the triangles are congruent |
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