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13.8 exercise question number 7 and 9 explain everything critically

Posted by Kanha Vashu Rai 8 years, 3 months ago

CBSE > Class 09 > Mathematics

1 answers

Kanha Vashu Rai 8 years, 2 months ago

Let r be the radius of the sphere. Given : surface area of a sphere= 154cm^2 Since 4pier^2= 154 =r^2 =154×7/22×4 r= 7/2cm Hence , volume of a sphere= 4/3pie (7/2)^2 "4/3pier^2" = 4/3×22/7×7/2×7/2×7/2 = 11×7×7/3 = 179.667= 179.67cm^3

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