ISO trapezoid v2

bases of Isosceles trapezoid measured 16 cm and 4 cm and its perimeter is 47 cm. What is the are of a trapezoid?

Correct result:

S =  178.38 cm2

Solution:

a=16 cm b=4 cm o=47 cm  o=a+b+2c  c=o−a−b2=47−16−42=272=13.5 cm  x=∣a−b∣2=∣16−4∣2=6 cm  h=c2−x2=13.52−62≐12.0934 cm  S=a+c2⋅ h=16+13.52⋅ 12.0934=178.38 cm2

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