solve this question please Q-12and13
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12) area of shaded region = area of square - area of circle
area of shaded regio = (side length)^2 -pi.r^2
= (40)^2 -22/7 x 14 x14
= 1600 - 616 = 984 cm^2
13) area of remaining sheet = area of rectangle - 2 x area of semicircle
we see both semicircle have same radius so , 2 x area of semicircle = area of circle .
now ,
area of remaining part =10 x 7 -22/7 x (7/2)^2
= 70 - 37.5 = 32.5 cm^2
area of shaded regio = (side length)^2 -pi.r^2
= (40)^2 -22/7 x 14 x14
= 1600 - 616 = 984 cm^2
13) area of remaining sheet = area of rectangle - 2 x area of semicircle
we see both semicircle have same radius so , 2 x area of semicircle = area of circle .
now ,
area of remaining part =10 x 7 -22/7 x (7/2)^2
= 70 - 37.5 = 32.5 cm^2
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