2003
Mathematics
JAMB
An arc of a circle subtends an angle of 30° on the circumference of a circle of radius 21cm. Find the length of the arc.
A.
11cm
B.
22cm
C.
44cm
D.
66cm
Correct Answer: 22cm
Explanation
θ = 30 x 2(∠ at center twice ∠ at θ) ∴ θ = 60° Length of arc = θ/360 x 2πr = 60/360 x 2 x 22/7 x 21/1 = 22cm
θ = 30 x 2(∠ at center twice ∠ at θ) ∴ θ = 60° Length of arc = θ/360 x 2πr = 60/360 x 2 x 22/7 x 21/1 = 22cmTHIS WEEK's
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