x68.In triangle ABC, if a=13, b=14, c=15, then r1=?1) 21/22) 14 3) 65/ – InterviewSolution

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x68.In triangle ABC, if a=13, b=14, c=15, then r1=?1) 21/22) 14 3) 65/8 4) 4

Answer»

We know that circumradius =abc/4∆

by herons law ∆=✓(s(s-a)(s-b)(s-c))

where s=13+14+15/2=21

∆=√(21(8)(7)(6)

∆=84

now ,circum radius,r1 =∆/(s-a)=84/(21-13)=10.5

Option (1) is correct.

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