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If legs of a right triangle are 3 and 4, the hypotenuse is
A12
B7
C6
D5
Answer & Solution
Correct answer: D. 5
1. Use a^2 + b^2 = c^2 with a = 3, b = 4.
2. c^2 = 9 + 16 = 25.
3. c = sqrt(25) = 5.
4. So the hypotenuse is 5.
_Source: Selina Concise Mathematics Class 9, Ch on Pythagoras Theorem (Mistral OCR'd PDF), section on numerical example_
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