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Aatif Farooq · Answer 1 · 2019-06-07T19:59:48+0000

This is one of the two tired triangles of trig you should memorize. An isosceles right triangle has its sides in ratio
$1:1:\sqrt 2$ . That means the hypotenuse is the square root of two times either side.

u = √(2) * √(2) = 2

Answer: C

If you didn't know you could write

$v = \sqrt 2$

v^2 + v^2 = u^2

u^2 = 2 + 2 = 4

u = 2

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