Question

Total surface area of a cone of radius 5 cm and slant height 10 cm is .
$(Take\pi =3.14)$

• A. $235.5c{m}^2$
• B. $335.5c{m}^2$
• C. $245c{m}^2$
• D. $437c{m}^2$

Answer 1

The correct option is A $235.5c{m}^2$

Given: Radius of the cone, r = 5 cm
Slant height of the cone, l = 10 cm

Total surface area of the cone
$=\pi r(r+l)$
$=\pi \times 5(5+10)$
$=5\pi \times 15$
$=75\pi$
$=235.5{\text{cm}}^2$
$\therefore$ Total surface area of the cone is
$235.5{\text{cm}}^2$.