Find the curved surface area of a cone with cir... - JAMB Mathematics 2005 Question
Find the curved surface area of a cone with circular base diameter 10 cm and height 12 cm
A
25 πcm2
B
65 πcm2
C
120 πcm2
D
156 πcm2
correct option: b
L2 = 122 + 52
= 144 + 25
= 169
L = √169
= 13
Curved surface Area = πrL
= 5/1 * 13/1 * π
= 65πcm2
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