2001
Mathematics
JAMB
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
Correct Answer: πr/3
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
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/3THIS WEEK's
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