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The coordinates of opposite vertices of the square ABCD are A $(-5, 0)$ and C$(0, 5)$. The length of a diagonal of the square ABCD is :
- (a)$5$ units
- (b)$10$ units
- (c)$\sqrt{10}$ units
- (d)$\sqrt{50}$ units
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Ans. (d) $\sqrt{50}$ units