Answer the question 3 with full steps
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area of trapezium = 1/2 × (sum of parallel sides) × height
area given = 640 cm^2
height = 13cm
ratio of parallel sides = 7:9
let the common factor be x
so the parallel sides = 7x cm, 9x cm
total of parallel sides =16x cm
so,
=> 640 = (1/2) × 16x × 13
=> 640 = 8x × 13
=> x = 640 × 13/8
=> x = 80 × 13
=> x = 1040 cm
so, the parallel sides are (7 × 1040) = 7280cm
(9 × 1040) = 9360cm
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