The area of a trapezium is 54 cm² and length of one of the parallel side is 12 cm and height is 6 cm. Find the length of other parallel side.
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area of trapezium is 54cm^2
1/2×h(a+b)
1/2×6(12+b)=54cm^2
3(12+b)=54cm^2
36+3b=54
3b=54-36
3b=18
b=18/3
b=6
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