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 Sep 18, 2022
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If the radius of a circle is 3 cm and an arc is $\frac{2\pi}{7}cm long, then the angle subtended at the centre of the circle by the arc is
Difficulty: Easy
A: 
$\frac{7\pi}{2}$
B: 
$\frac{2\pi}{21}$
C: 
$\frac{5\pi}{2}$
D: 
$\frac{7\pi}{3}$
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NETNUST Entry TestMathematicsTrigonometric Identities of Sum and Difference of Angles