Question

What is the cosine of a 30° angle?
(Points : 1)
Option A:


Option B:

Option C:

Option D:

Answer 1

Why not draw a 30 degree angle in Quadrant 1? Make a triangle out of it. Label each of the sides of this triangle, as appropriate: opposite side, adjacent side, hypotenuse.

The cosine of 30 degrees is defined as the RATIO \[\cos 30~\deg = \frac{ opposite ~side }{ hypotenuse }\]