a sector of a circle of radius 7 2cm which subt... - JAMB Mathematics 2001 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?
A
8cm
B
6cm
C
9cm
D
7cm
correct option: b
(r/L) = (θ/360°)
Given θ = 300, and L = 7.2cm,
=> r = (300 x 7.2)/360
r = 6cm
Given θ = 300, and L = 7.2cm,
=> r = (300 x 7.2)/360
r = 6cm
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