8-6+Study+Guide


 * Example 2 Identify Isosceles Trapezoids**

**GARDENING** **A cold frame is placed over plants** The panels on the sides are trapezoids. The front and back panels are rectangles. The bottom and top are also rectangles.
 * on the ground to protect them during cold**
 * weather. The top of the frame is glass or plastic**
 * to allow the sunlight in and to hold in the heat.**
 * The cover slants downward to the south to let in**
 * as much sunlight as possible. Identify the shape**
 * of each quadrilateral used to construct the cold**
 * frame shown at the right.**

**COORDINATE GEOMETRY** **//ABCD// is a quadrilateral**
 * Example 3 Identify Trapezoids**
 * with vertices //A//(-4, -10), //B//(-5, -3), //C//(-1, 1), and //D//(6, 0).**


 * a. Verify that //ABCD// is a trapezoid.**

A quadrilateral is a trapezoid if exactly one pair of opposite sides are parallel. Use the Slope Formula.

slope of = = or -7 || slope of = || = or 1 ||  || slope of = = || slope of = || = or 1 ||  ||

Exactly one pair of opposite sides are parallel, and. So, //ABCD// is a trapezoid.