
To find the surface area of given hemisphere to the nearest tenth.

Answer to Problem 17PPS
530 mm2
Explanation of Solution
Given: The circumference of the great
Formula used:
Surface area of a hemisphere =3πr2
And circumference of great circle of a hemisphere =2πr , where r is the radius of the hemisphere.
Calculation:
2πr=15π⇒r=15π2π⇒r=7.5
Surface area of given hemisphere,
=3πr2=3·π·(7.5)2=3×π×56.25=530.1∼530 (to nearest tenth)
Hence, surface area of given hemisphere is 530 mm2.
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