ISO trapezoid v2

Bases of Isosceles trapezoid measured 20 cm and 4 cm, and its perimeter is 55 cm. What is the area of a trapezoid?

Correct answer:

S =  159.31 cm2

Step-by-step explanation:

a=20 cm b=4 cm o=55 cm  o = a+b + 2r  r=2oab=255204=231=15.5 cm  x=2ab=2204=8 cm  h=r2x2=15.528213.2759 cm  S=2a+b h=220+4 13.2759=6 705=159.31 cm2



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