Which set of side lengths forms a right-angled triangle?
Answer and explanation
Correct answer: C. 9 cm, 40 cm, 41 cm
- Step 1: A triangle is right-angled if the squares of the two shorter sides add to the square of the longest.
- Step 2: Test : and , so they match.
- Step 3: The others fail: but ; but ; but .
Answer
9 cm, 40 cm, 41 cm.
Why not the others: 8 cm, 15 cm, 18 cm: but . 6 cm, 9 cm, 11 cm: but . 10 cm, 24 cm, 27 cm: but .
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