Trapezoid

Calculate area of trapezoid ABCD with sides |AD|= 68 cm, |DC|=35 cm, |CB|=12 cm, |AB|=35 cm..

Correct result:

A =  840 cm2

Solution:

 s=6812+35+352=63 cm S1=s(s56)(s35)(s35)=588 cm2 v=2S16812=21 cm A=68+122v=840 cm2



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