Determine the area of a trapezoid with bases 71 and 42 and height is 4 shorter than the its leg.

Correct result:

S =  1371.89


h=r4 r2=h2+((ac)/2)2 h2+2h4+42=h2+((7142)/2)2 h=24.28  S=a+c2h=71+42224.28=1371.89

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