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February 23, 2018 10:46 AM

Hello sir,

Please help me with the approach.

31 Answers

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November 21, 2019 6:37 PM

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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November 20, 2020 9:34 PM

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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