1.

The radius of a sphere is 3.5 cm. Find it’s surface area.

Answer»

Given, r = 3.5 cm 

Surface area of sphere = 4πr2

= 4 × \(\frac{22}{7}\) × 3.5 × 3.5 

\(\frac{88\times12.25}{7}\) 

= 154 cm2



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