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(22 From a circular sheet of radius 10 cm, a disc of radius 3 cm is cut out and the portion of the sheet left behind is0.35 per cm: Find the cost of painting the sheet (Use Ď-)22painted at the rate ofOR |
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Answer» Step-by-step explanation: The radius of circular sheet is 10 cm We have to find Area of outer sheet Area of outer sheet = πr² = 22 / 7 × (10)² = 22/7 × 100 ` = 314.28 cm² Now we have to find out the Area of cut out sheet radius of cut out sheet = 3 cm Area of cut out sheet = πr² =22/7 × (3)² = 22/7 × 9 = 28.28 cm² Area of remaining sheet = area of outer sheet - area of cut out sheet = 314.28 - 28.28 = 286 cm² Cost of painting per cm = Rs. 0.35 Cost of painting 286 cm = 286 × 0.35 =Rs . 100.10 Hence the cost is Rs. 100.10 ok |
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