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The hypotenuse of a right triangle with legs 9 cm and 12 cm is
A16 cm
B15 cm
C18 cm
D21 cm
Answer & Solution
Correct answer: B. 15 cm
1. Apply a^2 + b^2 = c^2 with a = 9, b = 12.
2. c^2 = 81 + 144 = 225.
3. c = sqrt(225) = 15.
4. So the hypotenuse is 15 cm.
_Source: Selina Concise Mathematics Class 9, Ch on Pythagoras Theorem (Mistral OCR'd PDF), section on numerical example_
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