11. Acircle of radius 2 cm is cut out from a square piece of an aluminium sheet of side 6 cm. What is the area of the left over aluminium sheet? (Take n = 3.14) 12. The circumference of a circle is 31.4 cm. Find the radius and the area of the circle? (Take = 3.14)
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Solution:
Side of square piece of aluminum sheet = 6 cm
Radius of circle = 2 cm
Area of aluminium sheet left = Total area of square aluminium sheet – Area of circle
= Side × Side - πr2
= 6 cm × 6 cm - 3.14 × 2 cm × 2 cm
= 36 cm2 - 12.56 cm2
= 23.44 cm2
Therefore, the area of the aluminum sheet left is 23.44 cm2.
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