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4.5-4.7
| Term | Definition |
|---|---|
| ASA congruence postulate | If two angles and the included side of one triangle are congruen to two angles and the included side of the a second triangle, then the two triangles are congruent |
| AAS congruence postulate | If two angles and a non-included side of one triangle are congruent to two angles and the corresponding non included side of a second triangle, the the two triangles are congruent. |
| Flow Proof | uses arrows to show the flow of a logical argument |
| CPCTC | A pair of sides or angles that have the same relative position in two congruent or similar figures |
| Vertex angle | The angle formed by the legs |
| Legs of an isosceles triangle | The two congruent sides of an isosceles triangle that has only two congruent sides |
| Base of an isosceles triangle | the non-congruent side of an isosceles triangle that has only two congruent sides |
| Base of angles of an isosceles triangle | The two angles adjacent to the base |
| Base Angles Theorem | If two sides of a triangle are congruent, then the angles opposite them are congruent If AB is congruent to AC, then Angle B is congruent to angle C |
| Converse of Base Angles Theorem | If two angles of a triangle are congruent, then the sides opposite them are congruent |
| Corollary to the Base Angles Theorem | If a triangle is equilateral, then its equiangular |
| Corollary to the Converse of the Base Angles Theorem | If a triangle is equiangular, then it is equilateral |