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An are of certain length subtends 20^@17...

An are of certain length subtends `20^@17'` at the centre of a circle of radius 6 cm . Find in sexagesimal unit the angle subtended by the same arc at the centre of a circle of radius 8 cm .

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The correct Answer is:
Therefore, the required angle in sexagesimal unit `=15^@'45"` ..
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