Question

Find the diameter of sphere whose surface area is 154cm²

Answer 1

Hey mate ,

Surface area of sphere = 4πr^2

154 = 4π r ^2

154×7/(22×4)= r^2

7×7 /4 = r^2

49/4= r^2

√ (49/4) = r

R = 7/2

Diameter = 2Radius = 2×7/2

Diameter = 7 cm

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Answer 2

Diameter is 7cm.
Hope this help you