The curved surface area of a cone of slant height l and radius r is given by

\frac{1}{3} π / r^{2}

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π r l

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π r l^{2}

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\frac{1}{3} π r l

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Solution

The correct option is B $π r l$
A cone is a three-dimensional geometric shape consisting of all line segments joining a single point to every point of a two-dimensional figure.
Slant height of cone (l)= $\sqrt{r^{2} + h^{2}}$ Them covered surface area of cone = $π r l$

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Question 5
The total surface area of a cone whose radius is $\frac{r}{2}$ and slant height 2l is:

A) $2 π r (l + r)$
B) $π r (l + \frac{r}{4})$
C) $π r (l + r)$
D) $2 π r l$

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The curved surface area of a cone of slant height l and radius r is given by

The correct option is B πrlA cone is a three-dimensional geometric shape consisting of all line segments joining a single point to every point of a two-dimensional figure.Slant height of cone (l)=√r2+h2Them covered surface area of cone =πrl

The correct option is B $π r l$
A cone is a three-dimensional geometric shape consisting of all line segments joining a single point to every point of a two-dimensional figure.
Slant height of cone (l)= $\sqrt{r^{2} + h^{2}}$ Them covered surface area of cone = $π r l$