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Difficulty: 2/102025 IOQM 2025 (Q19)

In a right-angled triangle, the lengths of the two legs are and . Find the length of the hypotenuse.

Options:

  • A.

    18

  • B.

    17

  • 15

  • D.

    16

Guide / Hint

Hint 1: Use the Pythagorean Theorem: .

Hint 2: Compute: .

Hint 3: Find the square root of 225, which gives the length of the hypotenuse.

Solution

Step 1: Let the legs of the right triangle be and , and the hypotenuse be . By the Pythagorean Theorem:

Step 2: Substitute the values:

Step 3: Take the square root of both sides:

So the length of the hypotenuse is . Note that this is a scaled version of the famous Pythagorean triple (scaled by factor of 3).

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