How to Graph an Angle in Terms of PI

The video tutorial explains how to determine if the cosine of an angle is positive or negative using the unit circle. It covers graphing the angle 7π/8, understanding π in terms of eighths, and identifying the terminal side of the angle. The tutorial concludes by determining the sign of the X coordinate in the second quadrant, emphasizing that it is negative.

What does the cosine of an angle represent on the unit circle?

• The angle in degrees

• The radius of the circle

• The x-coordinate of the point

• The y-coordinate of the point

How is the angle 7π/8 visualized on the unit circle?

• As a full circle

• As seven-eighths of a half-circle

• As a quarter of a circle

• As a straight line

In which quadrant does the angle 7π/8 lie?

• Fourth quadrant

• Second quadrant

• First quadrant

• Third quadrant

What is the sign of the x-coordinate for the angle 7π/8?

• Zero

• Negative

• Undefined

• Positive

Why is the x-coordinate negative for the angle 7π/8?

• Because it is in the third quadrant

• Because it is in the second quadrant

• Because it is in the first quadrant

• Because it is in the fourth quadrant