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A sector of a circle of radius 7.2cm which subtends an angle of 300° at the cen...


Question

A sector of a circle of radius 7.2cm which subtends an angle of 300° at the centre is used to form a cone. What is the radius of the base of the cone?

Options

A) 8cm

B) 6cm

C) 9cm

D) 7cm

The correct answer is B.

Explanation:

(r/L) = (θ/360°)
Given θ = 300, and L = 7.2cm,
=> r = (300 x 7.2)/360
r = 6cm

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