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Question

In the following figures, find the area of the shaded portions:

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Solution

(i)

Area of EFDC = ar (ABCD) − ar (BCE) − ar (AFE)

= (18 × 10) −(10 × 8) − (6 × 10)

= 180 − 40 − 30 = 110 cm2
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(ii)

ar (QTU) = ar (PQRS) − ar (TSU) − ar (RUQ) − ar (PQT)

= (20 × 20) −(10 × 10) − (20 × 10) −(20 × 10)

= 400 − 50 − 100 − 100 = 150 cm2


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