# ravehs school

A sector of a circle of radious 10cm and an angle 108° is bent to from a cone find the base radius

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posted by Reed
2. Make two diagrams, one showing the sector in the original circle, and the second showing the cone

It should be clear to you that the arc of the sector becomes the circumference of the base of the cone.

arc/circumference = 108/360
arc/20π = 3/10
arc = 60π/10 = 6π cm

let the radius of the cone base be r
2πr = 6π
r = 3

the cone has a base radius of 3 cm

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posted by Reiny

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