Find the sum of the lengths of the parallel sides of a trapezium whose altitude is 4 cm and area is 28 cm2.
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area of a trapezium=h(parallel sides/2)
28cm^2=4(a+b/2)
7=(a+b/2)
a+b=7*2=14cm
28cm^2=4(a+b/2)
7=(a+b/2)
a+b=7*2=14cm
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