Question:

Find the length of the hypotenuse of a right-angled triangle if the remaining sides are \( 9 \, \text{cm} \) and \( 12 \, \text{cm} \).

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For right triangles, always apply the Pythagoras theorem: \( c^2 = a^2 + b^2 \).
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Solution and Explanation

Step 1: Using the Pythagoras theorem: \[ \text{Hypotenuse}^2 = \text{Side}_1^2 + \text{Side}_2^2. \] Step 2: Substituting \( \text{Side}_1 = 9 \, \text{cm} \) and \( \text{Side}_2 = 12 \, \text{cm} \): \[ \text{Hypotenuse}^2 = 9^2 + 12^2 = 81 + 144 = 225. \] Step 3: Taking the square root: \[ \text{Hypotenuse} = \sqrt{225} = 15 \, \text{cm}. \]
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