pezoids our Turn 1 According to the isosceles trapezoid theorems label the figures appropriately acht Isosceles Trapezoid

Question

pezoids our Turn 1 According to the isosceles trapezoid theorems label the figures appropriately acht Isosceles Trapezoid Theorems If a quadrilateral is an isosceles trapezoid then then the trapezoid is isosceles 1 A trapezoid is isosceles if and only if EXPLAIN 3 Read the section below and complete the following activity adapted from Lesson 9 5 Using Theorems about Isosceles Trapezoids You can use properties of isosceles trapezoids to find unknown values Example Find each measure or value 1 The Upper Scioto River Bridge in Columbus Ohio has side sections that show isosceles trapezoids The figure ABCD represents one of these sections AC 13 2m and BE 8 4m Find DE AC BD AC BD 13 2 BD BE ED BD 8 4 x 13 2 x 4 8 DE 4 8m E Property that diagonals of isosceles trapezoid are congruent Definition of congruent segments Substitute 13 2 for AC Given Segment Additional Postulate Substitute 8 4 for BE Given Subtract 8 4 on both sides

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