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Hello sir, 

Please help me with the approach.

p4
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In a circle chords ab and cd intersect perpendicularly at p. If ap= 20, pb= 36, and cp= 24, then the perimeter of the circle is. 

This post was modified 1 year ago by tanvi
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a)96   b) 75   c)80  d)88

@amritamirchandani
Hi Amrita,
Let the radius of the larger circle R. So
AB × BC = FB² ( Chord Intersection Theorem)
R (R-42) = (R -24)²
R = 96
Now AC = AD - CD = 2 × 96 -28 = 150
Radius of the smaller circle => AC/2 = 75

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