If the area of a rectangle is equal to the curved surface area of the cone, then find the breadth of the rectangle in terms of radius $(r)$ , slant height $(h)$ and length $(l)$ .

\frac{π l h}{r}

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\frac{π r h}{l}

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\frac{π r l}{h}

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$\frac{h r l}{π}$

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Solution

The correct option is B $\frac{π r h}{l}$
Area of rectangle = C.S.A of cone (given)

$l \times b = π r h$

$b$ = $\frac{π r h}{l}$

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If the area of a rectangle is equal to the curved surface area of the cone, then find the breadth of the rectangle in terms of radius(r), slant height(h) and length (l).

The correct option is B πrhlArea of rectangle = C.S.A of cone (given) l×b=πrh b = πrhl

If the area of a rectangle is equal to the curved surface area of the cone, then find the breadth of the rectangle in terms of radius $(r)$ , slant height $(h)$ and length $(l)$ .

The correct option is B $\frac{π r h}{l}$
Area of rectangle = C.S.A of cone (given)

$l \times b = π r h$

$b$ = $\frac{π r h}{l}$