Four sides of trapezoid

Calculate the area of the ABCD trapezoid with sides a = 65 cm, b = 29 cm, c = 40 cm, d = 36 cm

Correct answer:

S =  1512 cm2

Step-by-step explanation:

a=65 cm b=29 cm c=40 cm d=36 cm  A=a+bc+d=65+2940+36=90 cm B=abc+d=652940+36=32 cm C=a+bcd=65+294036=18 cm D=a+b+c+d=65+29+40+36=40 cm  S1=A B C D=90 32 18 40=1440 cm2  k1=4 (ac)a+c=4 (6540)65+40=2021=1.05  S=k1 S1=1.05 1440=1512 cm2

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