### Home > PC > Chapter 4 > Lesson 4.2.2 > Problem 4-87

4-87.

What must the signs be for

the coordinates in Quadrant III?

Find the missing side. Note: The hypotenuse is always +.

Find the cos β.

Follow a similar thinking process as in (a).

4-87.

What must the signs be for

the coordinates in Quadrant III?

Find the missing side. Note: The hypotenuse is always +.

Find the cos β.

Follow a similar thinking process as in (a).