Class 11Mathematics10-1.Circle and System of CirclesGeometrical problems regarding circle and its properties
EasyThe radius of the circle whose arc of length $15 \ cm$ makes an angle of $3/4$ radian at the centre is ..... $cm$.
- A$10$
- B$20$
- C$11\frac{1}{4}$
- D$22\frac{1}{2}$
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