The unit circle has a radius of 1 and a center at the point (0, 0). The unit circle is helpful in finding the values of sine, cosine and tangent. On the unit circle, the x value of a coordinate is the cosine value, and the y value of a coordinate is the sine value. The equation of the unit circle is x^2 + y^2 = 1.
Instructions
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1
Draw a graph, and label the x-axis (horizontal axis) and y-axis (vertical axis).
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2
Draw a point 1 unit to the right on the x-axis at (1, 0) and a point 1 unit to the left on the x-axis at (-1, 0). Draw a point 1 unit up on the y-axis at (0, 1) and 1 unit down on the y-axis at (0, -1).
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3
Connect the points to form the circle.