Question

यदि किसी वृत्त की त्रिज्या 10% घटा दी जाए तो वृत्त का क्षेत्रफल कितना कम हो जाएगा?

Answer 1

Use the relation a + b + ab/100

Change in area = - 10 - 10 + (-10 x -10)/100

= -20 + 1 = -19

=> Area will decrease by 19%

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