Find the curved surface area of a cone, whose
(a) slant height is 60 cm and the radius of its base is 21 cm.
(b) slant height is 10 cm and base radius is 7 cm.(NCERT)
(c) diameter of the base of a cone is 10.5 cm and its slant height is 10 cm
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Answer:
a) 3960
b) 220
Step-by-step explanation:
CSA of cone =pi*r*l = (22/7)* 21*60 =3960
CSA of cone =pi*r*l = (22/7)* 7*10 =220
CSA of cone =pi*r*l = (22/7)* (10.5/2)*10 = 165
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