Question

find the sum of the lengths of the Base of a trapezium whose area is 4.2 m2 and whose height is 280cm

Answer 1

Given, 
Area of trapezium = 4.2m^2
Height = 280 cm = 2.8m
Sum of lengths = 2 * 4.2/2.8 = 3m

Answer 2

Area = 0.5*(sum of parallel sides)*h

Therefore,

Sum of parallel sides = (4.2*100*100*2)/280 cm

= 300 cm

= 3m

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