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The middle point of A (1, 2) and B (x, y...

The middle point of A (1, 2) and B (x, y) is C (2, 4). If BD is perpendicular to AB such that CD = 3 unit, then what is the length BD ?

A

`2 sqrt2` unit

B

2 unit

C

3 unit

D

`3 sqrt2` unit

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The correct Answer is:
B
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