1.

Find the surface area of a sphere of radius 7 cm.

Answer»

Given: For the sphere, 

radius (r) = 7 cm 

To find: Surface area of the sphere.  

Surface area of sphere = Aπr2 

= 4 × 22/7 × (7) 

= 88 × 7 

= 616 cm2 

∴ The surface area of the sphere is 616 cm



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