| A | B |
|---|
| altitude of a triangle | The endpoints of the segment are on a vertex of a triangle and a point on the line containing the opposite side; it is perpendicular to the line containing the opposite side |
| median of a triangle | a segment that joins the vertex of the triangle and the midpoint of the side opposite the vertex |
| angle bisector | a segment from the vertex that divides the angles into equal parts |
| perpendicular bisector | a segment bisector that is perpendicular to the segment |
| indirect proof | a proof in paragraph form: assume the hypothesis is true and the conclusion false; show that assumteion leads to contradiction of hypothesis; point out assumtpin false and conclusion must be true |
| hypotenuse | in a right triangle, the, the side opposite the right angle |
| leg of a right triangle | the sides opposite the acute angles |
| right triangle | a triangle with one right angle |
| indirect reasoning | you assume the opposite of what you want to prove, then show the assumption leads to contradiction |
| negation | ? |
| contradiction | ? |
