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Complete IIT AIEEE ICSE ISC PMT help forum :: Maths :: Maths Question answer

Maths icse Sample Question.[circle]

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abhas
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PostSubject: Maths icse Sample Question.[circle] ICSE - Maths icse Sample Question.[circle] EmptyMon Jan 28, 2008 12:24 pm
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PostSubject: Re: Maths icse Sample Question.[circle] ICSE - Maths icse Sample Question.[circle] EmptyThu Jul 03, 2008 4:06 pm
Connect point A and O, extend AO to meet BC at D and the circle at E.

As triangle ABC is an isosceles triangle, AD is perpendicular bisector of BC.

So AD = sqrt(10^2 - 6^2) = 8

In Rt triangle ABE, BD is an altitude. So AB^2 = AD*AE
AE = (AB^2)/AD = 100/8 = 25/2

As AE = 2R
So R = AE/2 = 25/4
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