| A | B |
|---|
| Perpendicular | 2 lines, rays, or segments that meat at a common point and form a right angle. |
| Oblique | 2 rays, lines, or segments that meat at a common point but are nut perpendicular. |
| Complementary | When the measures of two angle add up to 90 |
| Supplementary | When the measures of two angles add up to 180 |
| Bisector | A ray that divides an angle into two congruant angles |
| Trisector | A ray that divides an angle into 3 congruant angles |
| Reflexive Prop. | A=A |
| Transitive Prop. | A=B B=C A=C |
| Symmetry Prop. | A=B B=A |
| Congruent Triangles, Polygons | <=> all pairs of corresponding parts are congruent |
| Any sgment or angle is congruent to itself. | Reflexive Property |
| SSS Postulate | If there exists a correspondance between the vertices of two triangles such that three sides of one triangle are congruent to the corresponding sides of the other triangle, the two triangles are congruent. |
| SAS Postulate | If there exists a correspondance between the vertices of two triangles such that two sides and the icluded angle of one triangle are congruent to the corresponding parts of the other triangle, the two triangles are congruent. |
| ASA Postulate | If there exists a correspondance between the vertices of two triangles such that two angles and the icluded side of one triangle are congruent to the corresponding parts of the other triangle, the two triangles are congruent. |
| CPCTC | "Corresponding Parts of Congruent Triangles are Congruent." |
| Isosceles Triangle | At least two are congruent |
| Scalene Triangle | No two sides are congruent |
| Equalateral Triangle | All sides are congruent |
| Equiangular Triangle | All angles are congruent |
| Acute Triangle | All angles are acute |
| Right Triangle | One angle is right |
| Obtuse Triangle | One of the angles is obtuse |
| Legs of a right triangle | Sides that form the right angle |
| Hypotenuse | The side opposite the right angle |
| Vertex angle | The angle opposite the base |
| base angles | Angle formed by the base and the adjacent side |
| base | Side that is congruent to neither of the other sides |
| legs of an isosceles triangle | One of the two congruent sides of an isosceles triangle |
