Calculate the area of trapezoid ABCD with sides |AB|= 82 cm, |BC|=60 cm, |CD|=19 cm, |AD|=39 cm..

Correct answer:

S =  1818 cm2

Step-by-step explanation:

a=82 cm b=60 cm c=19 cm d=39 cm  x=ac=8219=63 cm  s=2x+b+d=263+60+39=81 cm  S1=s (sx) (sb) (sd)=81 (8163) (8160) (8139)=1134 cm2  S1 = x h/2  h=2 S1/x=2 1134/63=36 cm  S=2a+c h=282+19 36=1818=1818 cm2   Verifying Solution:   A=S1+a h=1134+82 36=4086 cm2 A=S

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