From a rectangular cardboard sheet 145cm long and 32cm broad, 42 circular plates each of diameter 8cm have been cut out. Find the area of the remaining portion of the sheet.
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Length of cardboard l =145 cm
Breadth of cardboard b =32 cm
Area of cardboard A1=l×b =145×32=4645cm^2
diameter of plates=8 cm
radius =4 cm
Area of plates=22/7×4×4=352/7cm^2
Area of 42 plates A2 =42×352/7=6×352=2112 cm^2
Area of remaining portion=A1-A2=4645-2112=2533cm^2
Breadth of cardboard b =32 cm
Area of cardboard A1=l×b =145×32=4645cm^2
diameter of plates=8 cm
radius =4 cm
Area of plates=22/7×4×4=352/7cm^2
Area of 42 plates A2 =42×352/7=6×352=2112 cm^2
Area of remaining portion=A1-A2=4645-2112=2533cm^2
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