23.The base area of a right circular cylinder is 16Π cm³. Its height is 5 cm. Its curved surface area is *
(A) 40π cm²
(B) 30π cm²
(C) 20π cm²
(D) 10π cm²
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Answer:
CSA = 40π
Step-by-step explanation:
given: A = 16π cm² , h = 5 cm
to find : CSA
CSA = 2πrh
πr² = 16π
=> r² = 16
=> r = 4 cm
therefore CSA = 2πrh
=> CSA = 2*π*4*5
=> CSA= 40π
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