The chord ST of a circle is equal to the radius... - JAMB Mathematics 2001 Question
The chord ST of a circle is equal to the radius, r, of the circle. Find the length of arc ST.
A
πr/6
B
πr/2
C
πr/12
D
πr/3
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Correct Option: D
Since ST = the radius r, => SOT is equilateral.
Each angle = 60°
Length of arc ST = θ/360 x 2πr
= 60/360 x 2 x π x r = πr/3
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