Trapezoid

How long are the trapezoid bases with area 24 cm2 and height 3 cm. One base is 3 times longer than the shorter.

Correct result:

a =  12 cm
c =  4 cm

Solution:


(a+c)/2•3 = 24
a = 3c

(a+c)/2•3 = 24
a = 3•c

3a+3c = 48
a-3c = 0

a = 12
c = 4

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