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An arc of length 22cm subtends an angle of θ at the...

An arc of length 22cm subtends an angle of θ at the center of the circle. What is the value of θ if the radius of the circle is 15cm?[Take π = 22/7]

A.

70o

B.

84o

C.

96o

D.

156o

E.

168o

Correct answer is B

2πr=2×3.142×15=94.28cm

94.28cm = 360°

1cm = \frac{360°}{94.28}

\therefore 22cm = \frac{360°}{94.28} \times 22

= 84°