a sphere has the same surface as a cylinder at height 4 cm and diameter of base 8 cm. Find radius of sphere
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Answer:
Total surface area of cylinder =2πrh+2πr²
=2π(4)(4)+2π(4)²
=32π+32π
=64π
Curved surface area of sphere =4πr² =64π
∴r=4 cm
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