Answer:
A. (-1, 0)
Explanation:
You want to know the terminal point on the unit circle of an angle of π radians in standard position.
Halfway
The angle π radians is halfway around the circle. The full measure of a circle is 2π radians. Halfway around puts the terminal point on the -x axis. Since the radius of a unit circle is 1 unit, the coordinates of the terminal point are (x, y) = (-1, 0).
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Additional comment
The point of interest is shown at left-center in the attachment.
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