sir what is the best way for solving the question of class 9th chapter of Surface areas and Volumes chapter of question no.1 of math of exercise 13.4 of math, what is the best way for solving the question of class 9th ncert book of question no.6 Find the radius of a sphere whose surface area is 154 cm2. (Assume π = 22/7)
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Find the radius of a sphere whose surface area is 154 cm2. (Assume π = 22/7) Q.6
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Let the radius of the sphere be r.
Surface area of sphere = 154 (given)
Now,
4πr2 = 154
r2 = (154×7)/(4×22) = (49/4)
r = (7/2) = 3.5
The radius of the sphere is 3.5 cm.