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8.5 Trapezoids

8.5 Trapezoids. Vocabulary. Trapezoids. What You'll Learn. You will learn to identify and use the properties of trapezoids and isosceles trapezoids . 1) Trapezoid. R. T. A. P. Trapezoids . parallel sides. quadrilateral.

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8.5 Trapezoids

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  1. 8.5 Trapezoids

  2. Vocabulary Trapezoids What You'll Learn You will learn to identify and use the properties of trapezoidsand isosceles trapezoids. 1) Trapezoid

  3. R T A P Trapezoids parallel sides quadrilateral A trapezoid is a ____________ with exactly one pair of ____________. The parallel sides are called ______. bases legs The non parallel sides are called _____. base Each trapezoid has two pair of base angles. leg leg base angles T and R are one pair of base angles. P and A are the other pair of base angles. base

  4. A B N M D C Trapezoids bases and the length of the median equals _______________ of the lengths of the bases. one-half the sum

  5. A B M N D C Trapezoids Find the length of median MN in trapezoid ABCD if AB = 16 and DC = 20 16 18 20

  6. Trapezoids If the legs of a trapezoid are congruent, the trapezoid is an _________________. isosceles trapezoid In lesson 6 – 4, you learned that the base angles of an isosceles triangle are congruent. There is a similar property of isosceles trapezoids.

  7. W X Z Y Trapezoids base angles

  8. R T 60° P A Trapezoids Find the missing angle measures in isosceles trapezoid TRAP. Theorem 8 – 14 P  A 120° 120° mP = mA 60 = mA Theorem 8 – 14 T  R 60° P + A + 2(T) = 360 60 + 60 + 2(T) = 360 120 + 2(T) = 360 2(T) = 240 T = 120 R = 120

  9. Trapezoids End of Section 8.5

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