Isosceles trapezium

Calculate the area of an isosceles trapezium ABCD if a = 10cm, b = 5cm, c = 4cm.

Correct result:

S =  28 cm2

Solution:

a=10 cm b=5 cm c=4 cm  x=(ac)/2=(104)/2=3 cm h=b2x2=5232=4 cm  S=a+c2 h=10+42 4=28 cm2



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