The area enclosed by two concentric circles is 330 sq cm.If the radius of the smaller circle is 8cm then find the radius of the largest circle.
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770=πR^2-πr^2
=π(R^2 -r^2) takingπ common
770/π =21^2 -r^2
770 *7/22 =441 - r^2
45- 441 = -r^2
-r^2 = -196
r = 14
=π(R^2 -r^2) takingπ common
770/π =21^2 -r^2
770 *7/22 =441 - r^2
45- 441 = -r^2
-r^2 = -196
r = 14
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