# From a circle of

Given, radius of circle = r = 15 cm

angle of sector(α) = 216°

Also, slant height of cone will be equal to the radius of the circle(L) = 15 cm

Let the radius and height of cone be r’& h respectively.

So, Area of the sector from circle = Curved surface area of the cone

r’ = 9 cm

As, L2 = r’2 + h2

h2 = L2 – r’2

h2 = 152 – 92

h2 = 225 – 81

h2 = 144

h = 12 cm

So

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