option B
Cos theta is positive and sin theta is negative in quadrant IV
We have to find opposite side using Pythagorean theorem.
x² + 4² = 5²
x² + 16 = 25
x² = 25- 16
x² = 9
IS THIS A FUNCTIONS OF NOT I NEED HELP
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It's not possible, because the sum of the lenghts of every two sides of a triangle has to be greater than the length of the third one. It this case that condition isn't met: 
