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In triangle ABC, if a = 2 and bc = 9, th...

In triangle ABC, if a = 2 and bc = 9, then prove that `R = 9//2Delta`

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`Delta = (1)/(2) bc sin A = (9)/(2) sin A = (9)/(2) (a)/(2R) = (9)/(2R)`
`rArr R = (9)/(2 Delta)`
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