Question

If the surface area of a sphere is 154cm², what will be its radius

Answer 1

Answer:

surface area of sphere =4πr²

154 = 4πr²

$r {}^{2} = \frac{154}{4\pi}$

$r = \sqrt{ \frac{154}{4\pi} }$

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Answer 2

Answer:

Radius = 3.5 cm

Step-by-step explanation:

Surface area of a sphere = 4* π * r²

=> 154  = 4 * 22/7 * r²

=>  r² = (154 * 7) / ( 4 * 22)

=>  r² = (7 * 7) /  4

=>  r² = 49/ 4

=> r = √49/4

=> r = 7/2 = 3.5 cm

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