Question

find T.S.A of sphere whose radius is 7 m​

Answer 1

Answer:

In formula π is a constant and its value is 227 or 3.14. Hence the surface area of the given sphere is 616cm2. Note: Whenever in our calculation if we have any multiple of 7 in the numerator then we always put π=227to make calculation easy and accurate.

Answer 2

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Radius of sphere = 7 m

T.S.A. of Circle = 4πr²

T.S.A. of Circle = 4 × $\frac{22}{7}$ × (7)²

T.S.A. of Circle = 4 × $\frac{22}{7}$ × 7 × 7

T.S.A. of Circle = 4 × $\frac{22}{\cancel{7}}$ × 7 × ${\cancel{7}}$

T.S.A. of Circle = 4 × 22 × 7

T.S.A. of Circle = 616 m²