A rectangular sheet of plastic is 40cm by 25cm. from it 50 circular badges, each diameter 4.2cm, have been cut out. find the area of the remaining sheet
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Area of Rectangular sheet, A = L * B
A = 40 * 25 = 1000 cm²
area of 50 badges , A' = 50 * π r²
A' = 50 * (22/7) * 2.1 * 2.1
A' = 50 * 22 * 21 * 21 / 7 * 100
A' = 1 1 * 3 * 2 1 = 693 cm ²
Remaining Area = 1000 - 693 = 307 cm²
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