8'6 Trapezoids

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8.6 Trapezoids
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Trapezoid - quadrilateral with exactly 1 pair of
opposite sides parallel
A
B
C
D
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Isosc Trap - trap with congruent legs
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Theorems

• Thm 8.18 both pairs of base angles are congruent
  in an isosc trap
• Thm 8.19 diagonals of an isosc trap are congruent

A
B
C
D
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• Median - seg connecting midpts of legs of a trap
  (also called midseg)
• Thm 8.20 the median of a trap is to the
  bases and is to the avg of bases

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Examples
22
A
B
4a-10
15
a ____
x
3a32.5
x ____
C
D
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Assignment

• 8.6 worksheet