A 120° sector of a circle of radius 21cm is bent to f...
A 120° sector of a circle of radius 21cm is bent to form a cone. What is the base radius of the cone?
31/2cm
7cm
1O1/2cm
14cm
21cm
Correct answer is B
The length of the arc subtended by the sector of angle 120° = circumference of the base of the cone.
120360×2×227×21=2πr
44=2πr
r=22÷π
r=22×722
r = 7 cm
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