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Question 100

Find the area to be painted in the following block with a cylindrical hole. Given that length is 15cm, width 12cm, height 20cm and radius of the hole 2.8cm.


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Solution

Length of the given figure = 15 cm
Width of the given figure = 12 cm
Height of the given figure = 20 cm
Radius of the hole = 2.8 cm
The area to be painted = Surface area of the figure - 2 × Area of the circular hole
=2(lb+bh+lh)2πr2=2(15×12+12×20+15×20)2×227×2.8×2.8=2(180+240+300)44×2.8×2.87=2×72049.28=144049.28=1390.72 cm2


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