Question

For each triangle, find the missing side length to the nearest tenth. :

The hypotenuse is 20 mm long. How long is the side adjacent to a 15 degrees angle.

Answer 1

We can use trigonometry.  The cosine of 15 will be the side adjacent to the 15-degree side (the one we are looking for) divided by 20, the hypotenuse.  As cos(15) is about .966, we get 19.32 as the side we are looking for.