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Difficulty: 5/102025 IOQM 2025 (Q13)

In a circle, chords and intersect at an interior point . If , , and , find the length of .

Options:

  • 8

  • B.

    10

  • C.

    11

  • D.

    9

Guide / Hint

Hint 1: Use the Intersecting Chords Theorem, which states that for two chords and intersecting at , .

Hint 2: Substitute the given values: .

Hint 3: Solve the simple linear equation: .

Solution

Step 1: By the Intersecting Chords Theorem, when two chords of a circle intersect at an interior point, the products of the segments of the chords are equal:

Step 2: We are given , , and . Substitute these values into the theorem:

Step 3: Solve for :

So the length of is .

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