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From an iron ring of radius 9 centimetre...

From an iron ring of radius 9 centimetres, a piece of central angle `30^(circ)` is cut off. This is then bent into a small circle. What is the radius of this circle?

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  2. From an iron ring of radius 9 centimetres, a piece of central angle 30...

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  3. From an iron ring of radius 9 centimetres, a piece of central angle 30...

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  4. In a circle, the length of an arc of central angle 40^(circ) 'is 3 pi ...

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