| A | B |
|---|
| scalene triangle | a triangle that has no side congruent |
| isoceles triangle | a triangle that has 2 sides congruent |
| equilateral triangle | a triangle that has all 3 sides congruent |
| triangle sum theorem | the sum of the angles measures up to 180 |
| vertex angle | the included angle of 2 congruent sides in triangle |
| interior | is a set of all pts inside the figure |
| exterior | is a set of all pts outside the figure |
| exterior angle | is formed by 1 side and the extention of adjacent side |
| third angles theorem | if 2 angles of 1 triangle are congruent to 2 andles of 2nd trianble, the the 3rd pair of angles are congruent |
| remote interior angle | is an interior angle that is not adjacent to the exterior angle |
| interior angle | is formed by 2 sides of a triangle |
| exterior angle theorem | measure of an exterior angle of a triangle is equal to the sum of the measures of is remote interior |
| isoceles triangle theorem | if 2 sides of a triangle are congruent, then two base angles are congruent |
| base | segment opposite of the vertex angle |
| base angles | angles opposite of the congruent angles |
| acute triangle | a triangle that has 3 acute angles |
| obtuse triangle | a triangle that has one obtuse angle |
| right triangle | a triangle that has one right angle |
| equiangular triangle | a triangle that has all 3 congruent angles |
| corollary | a theorem whose proof follows another theorem |
