Question

Given the diagram below, what is cos(45°)?

Answer 1

As we can see, this is a 45 45 90 triangle

The legs of the triangle are equal and the hypotenuse = leg * sqrt(2)

In this case,

The hypotenuse = 6 * sqrt(2)

Cos(45) = 6 / (6 * sqrt(2))

The 6's cancel each other out and you're left with:

1 / sqrt(2)

Answer 2

Answer is D

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