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

Mathematics
JAMB 2001

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?

  • A. 8cm
  • B. 6cm
  • C. 9cm
  • D. 7cm
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Correct Answer: Option B
Explanation

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

=> r = (300 x 7.2)/360
r = 6cm

There is an explanation video available below.

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