Mathematics
JAMB 2001
The chord ST of a circle is equal to the radius, r, of the circle. Find the length of arc ST.
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A.
πr/6
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B.
πr/2
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C.
πr/12
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D.
πr/3
Correct Answer: Option D
Explanation
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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