Find the area of the curved surface of a cone whose base radius is 3cm and whose height is 4cm (Ο = 3.14)
Correct Option:
C
Find the slant height
\( l^2 = h^2 + r^2(h = 4cm,r = 3cm)\)
\( l^2 = 4^2 + 3^2 = 16 + 9 = 25 \)
\( l^2 = β 25 \)
Squaring both sides
l = 5cm
The area of curved surface (s) =Ο(3)(5)
15Ο = 15 Γ 3.14
= 47.1cm2
\( l^2 = h^2 + r^2(h = 4cm,r = 3cm)\)
\( l^2 = 4^2 + 3^2 = 16 + 9 = 25 \)
\( l^2 = β 25 \)
Squaring both sides
l = 5cm
The area of curved surface (s) =Ο(3)(5)
15Ο = 15 Γ 3.14
= 47.1cm2