The curved surface area of a cone of slant height $l$ and radius $r$ is given by:
$\frac{1}{3} π / r^{2}$
$π r l$
$π r l^{2}$
$\frac{1}{3} π r l$

Question

The curved surface area of a cone of slant height l and radius r is given by-frac -1-3-pi -r-2pi rlpi rl-2frac -1-3-pi rl

Toppr Admin · Accepted Answer

Consider the given slant height l and radius r of the cone- -Then- curved surface area -Arc length of sectorCircumference of circle-xD7-Area of circle-2-x3C0-r2-x3C0-l-xD7-x3C0-l2-x3C0-rl-Therefore- option B is correct-

The curved surface area of a cone of slant height l and radius r is given by:13π/r2πrlπrl213πrl

Consider the given slant height l and radius r of the cone, Then, curved surface area =Arc length of sectorCircumference of circle×Area of circle=2πr2πl×πl2=πrl.Therefore, option B is correct.

The curved surface area of a cone of slant height $l$ and radius $r$ is given by:
$\frac{1}{3} π / r^{2}$
$π r l$
$π r l^{2}$
$\frac{1}{3} π r l$

Consider the given slant height $l$ and radius $r$ of the cone,

Then, curved surface area $= \frac{Arc length of sector}{Circumference of circle} \times Area of circle$
$= \frac{2 π r}{2 π l} \times π l^{2} = π r l$ .
Therefore, option $B$ is correct.