2016
Mathematics
67ca00ce0c643c71d77dee1f
An arc subtends an angle of 30o at the centre of a circle radius 12cm. Calculate the length of the arc.
A.
6π cm
B.
2π cm
C.
3π cm
D.
9π cm
Correct Answer: 2π cm
Explanation
Length or arc = θ/360 x 2πr = 30/360 x 2 x 22/7 x 12 = 1/12 x 2 x π x 2 = 2π cm
Length or arc = θ/360 x 2πr = 30/360 x 2 x 22/7 x 12 = 1/12 x 2 x π x 2 = 2π cmTHIS WEEK's
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