The total surface area of a solid hemisphere is 75 times the area of a circle whose diameter is 6 cm. What is
the radius (in cm) of the hemisphere?
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Answer:
given
radius=6/2=3
area of circle= πr square
A/Q,
3πr' = 75 ×πr×r
r' =75×3×3/3
= 75×3
= 225cm
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