JAMB - Mathematics (2005 - No. 23)
Find the curved surface area of a cone with circular base diameter 10 cm and height 12 cm
25 πcm2
65 πcm2
120 πcm2
156 πcm2
Shpjegimi
L2 = 122 + 52
= 144 + 25
= 169
L = √169
= 13
Curved surface Area = πrL
= 5/1 * 13/1 * π
= 65πcm2
= 144 + 25
= 169
L = √169
= 13
Curved surface Area = πrL
= 5/1 * 13/1 * π
= 65πcm2