Using the Pythagorean theorem, find the hypotenuse of a right-angled triangle whose other two sides are a = 3 and b = 4.

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• A 3.14
• B 5
• C 25
• D None of the above

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Answer: B. 5

Pythagoras says c^2 = a^2 + b^2 = 3^2 + 4^2 = 9 + 16 = 25. So c = square root of 25 = 5. Option c, 25, is c^2, not c.

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