Review of Quadrilaterals
Read this chapter, which summarizes all properties of various quadrilaterals, including the properties of their diagonals.
Isosceles Trapezoid
An isosceles trapezoid is a trapezoid with the non-parallel sides congruent. An additional property of isosceles trapezoids is base angles are congruent.
The Properties of an Isosceles Trapezoid:
1. One pair of opposite sides are parallel, i.e., .
2. Two pairs of adjacent angles are supplementary, i.e., and .
3. Base angles are congruent, i.e., and .
4. The diagonals are congruent, i.e., .