The diagonal of a square of side a is
Aa sqrt(2)
B2 a
Ca / 2
Da sqrt(3)
Answer & Solution
Correct answer: A. a sqrt(2)
1. A diagonal divides the square into two right triangles.
2. Each has legs a and a, hypotenuse d.
3. d^2 = a^2 + a^2 = 2 a^2.
4. So d = a sqrt(2).
_Source: Selina Concise Mathematics Class 9, Ch on Pythagoras Theorem (Mistral OCR'd PDF), section on diagonal of square_
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