Question

To form a cone from a sector of a circle and to find the formula for its curved surface area. With a example.

Answer 1

Answer:

Radius of the base of cone = r.

Slant height of the cone = Radius of circle = l.

Circumference of the base of cone = Arc length of sector = 2πr.

Now, curved surface area of cone = Area of the sector. = Area of sector = = = πrl.

Answer 2

Answer:

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