Home › ICSE Class 9 › mathematics › Pythagoras Theorem › The diagonal of a rectangle 5 cm by 12 cm is
The diagonal of a rectangle 5 cm by 12 cm is
A17 cm
B13 cm
C10 cm
D12 cm
Answer & Solution
Correct answer: B. 13 cm
1. The diagonal forms a right triangle with the two sides.
2. d^2 = 5^2 + 12^2 = 25 + 144 = 169.
3. d = sqrt(169) = 13.
4. So the diagonal is 13 cm.
_Source: Selina Concise Mathematics Class 9, Ch on Pythagoras Theorem (Mistral OCR'd PDF), section on application_
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