Trapezium bases

Find the trapezium height if a = 8 cm and c = 4 cm if its content 21 square centimeters.

Correct result:

h =  3.5 cm


a=8 c=4 S=21 S=(a+c)h/2 h=2 S/(a+c)=2 21/(8+4)=72=72 cm=3.5 cm

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