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The total surface area of a hemisphere is 75π cm2. Find its radius
waec-2018 ssce-exam-2018 waec-mathematics-2018 math
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The total surface area of a hemisphere is 75π cm2. Find its radius

A.  5.0 cm 

B.  7.0 cm 

C.  8.5cm   

D.  12.0cm

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judziy
Asked by judziyrep:1.4K
University of Benin Nigeria
15 July 2020

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peter
Peter answeredrep:1.4K
University of Lagos Nigeria
12 August 2020
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The Total surface area of Hemisphere = 3πr2

Where r is the radius.

Since the total surface area of Hemisphere is given as 75π,

75π = 3πr2

Divide both sides by 3π

r2 = 75π/3π

r2 = 25

Take the square root of both sides,

r = 5

Ans A

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