- Thread starter mira222
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Hint: Draw a sketch of the "situation" as described.

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What have you been taught about lengths of intersecting chords of circles?

Please share your thoughts/work about this problem - so that we know where to begin to help you.

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Please do a google search with keywords - "intersecting chords of circles" - and tell us what you found?I have only learn basic geometry, but please I am very confused on this problem

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If this problem was assigned in your course, then there is probably a method to solve it within that course. What have you learned in the course? That will help us think of alternative ideas.I have only learn basic geometry, but please I am very confused on this problem

If it is outside of a course (e.g. a contest problem or an admission test), then it tells you that you need to learn more geometry in order to do what is expected. Can you tell us about the context (as we ask you to do)?

Now, I think I already told someone else what I would do with this same problem. Draw in segments CA and AF, and think about the fact that CAF is a right triangle. Then the facts about intersecting chords or secants can be used; or perhaps something else that you have learned could take the place of those theorems. (But the theorems are very much worth learning!)

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I got the solution

You can use Intersecting Secant Theorem