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Q.

Given that A + B = R and A² + B² = R². The angle between A and B is

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a

$π / 4$

b

0

c

$π / 2$

d

$π$

answer is C.

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Detailed Solution

$\begin{array}{l} \cos θ = \frac{R^{2} - A^{2} - B^{2}}{2 AB} = \frac{R^{2} - R^{2}}{2 AB} = 0 \\ θ = π / 2 \end{array}$

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