| A | B |
|---|
| Trapezoid | A quadrilateral with exactly one pair of opposite sides that are parallel. |
| Isosceles Trapezoid | A trapezoid with congruent legs. |
| Trapezoid Base Angles Theorem | If a trapezoid is isosceles, then each pair of base angles is congruent. |
| Trapezoid Diagonals Theorem | If a trapezoid is isosceles, then its diagonals are congruent. |
| Converse of Base Angles Thm | If a trapezoid has one pair of congruent base angles,then it is an isosceles trapezoid. |
| Converse of Trapezoid Diagonals Thm | If a trapezoid has congruent diagonals, then it is an isosceles trapezoid. |
| Midsegment Theorem for Trapezoids | The midsegment of a trapezoid is parallel to each base, and its length is half the sum of the lengths of the base. |
| SASAS Congruence Thm | If three sides and the included angles of two quadrilaterals are congruent, then the quadrilaterals are congruent. |
| ASASA Congruence Thm | If three angles and the included sides of two quadrilaterals are congruent, then the quadrilaterals are congruent. |
| Kite | a quadrilateral that has two pairs of consecutive congruent sides, but opposite sides are not congruent. |
| Thm 6.24 | If a quadrilateral is a kite, then its diagonals are perpendicular. |
| Thm 6.25 | If a quadrilateral is a kite, then exactly one pair of opposite angles are congruent. |
