A trapezoid

A trapezoid 75 ft wide on top 85 ft on the bottom, the height is 120 ft. What is its area in the square yds?

Correct result:

S =  1066.6667 yd2

Solution:

c=75 ft a=85 ft h=120 ft  S1=a+c2⋅ h=85+752⋅ 120=9600 ft2 S=S1→ yd2=S1/9  yd2=9600/9  yd2=1066.667 yd2=1066.6667 yd2

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