the area of trapeziuam is 60cm² and the length of one of the parallel sides is 20cm and it's height is 4cm find the length of the other parallel side
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Step-by-step explanation:
a = height(a +b)/2
60 = 4(20+b)/2
60 = (80 + 4b)/2
60 = 40 + 2b
60-40 = 2b
20 = 2b
b=20/2
b = 10
ans: 10 cm
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