The height and radius of a cone are 3cm and 4cm respectively. Its surface area is:-
a)12sq.cm
b)6sq.cm
c)72sq.cm
d)57×3/4sq.cm
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Sorry to say but none option is correct. the correct answer is 47.14 cm²
Step-by-step explanation:
Radius = 3cm
Height= 4cm
Answer
r=3 cm and h=4 cm
Let l be the slant height of the cone.
l² = r² + h²
l²= 3²+ 4²
l²= 9+16
l²= 25
l= 5
Area of the curved surface= pie*h*l
22/7 * 3 *5 = 47.14 cm²
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