Question

If surface area of the sphere is 154cm square. Then find its diameter ?

Answer 1

Surface Area of Sphere = 4 x pie x r^2

154 = 4 x 22/7 x r^2

r^2 = 154 x 7/22 x 1/4

r^2 = 49\4

r = 7/2 = 3.5 cm

Therefore Diameter = 7 cm.

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Answer 2

surface area of sphere = 4π r square

154= 4 x 22/7 x r square

154 x 7/22 x 1/4 = r square

12.25= r square

3.5 CM = r

diameter = 2 x r
diameter = 2 x 3.5

diameter = 7 cm

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