Question

Given two concentric circles with center O. A line cut the circle at A,B,C and D respectively. If AB=10cm, find the length of CD.

Answer 1

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Answer 2

AB=10cm

let the big circle be C
so it s radius be R
let the radius of the second circle be r
it is given that AB=10cm
so radius of bigger circle is
R=AB+r
= 10+r
similarly,
R=CD+r
by comparing both the values
10+r=CD+r
CD=10cm