### Home > PC > Chapter 4 > Lesson 4.1.3 > Problem 4-43

4-43.

For each angle (in radians) listed below, determine the signs of the coordinates in a unit circle.

1. The denominator says the the top half of the circle should be divided into

pieces.

2. The numerator says go to the 4th piece starting from ()

3. This angle is the 2nd quadrant so the signs are () for ( ).

Move clockwise from (

).

Divide half of the circle into

pieces. Every pieces is one time around the circle.

intersects the unit circle at the point ( ), so the signs of the coordinates are ( ).