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Triangle ABC is right-angled at C with BC = 24 cm and AC = 7 cm. AB equals

A24 cm
B25 cm
C23 cm
D31 cm
Answer & Solution
Correct answer: B. 25 cm
1. AB is the hypotenuse (opposite the right angle). 2. AB^2 = AC^2 + BC^2 = 49 + 576 = 625. 3. AB = sqrt(625) = 25. 4. So AB = 25 cm. _Source: Selina Concise Mathematics Class 9, Ch on Pythagoras Theorem (Mistral OCR'd PDF), section on triangle naming_
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