For each point on the unit circle, select the angle that corresponds to it. Click each dot on the image to select an answer.

What are unit circle trigonometry problems? The problems in this lesson involve circles and angle measures in radians, a unit for angle measure much like degrees.

For each point on the unit circle, select the angle that corresponds to it. Click each dot on the image to select an answer.

When you add or subtract any multiple of π to an angle, it results in an angle that is in the same position on the unit circle, and the tangent function has the same value at that angle.

Learn how to use the unit circle to define sine, cosine, and tangent for all real numbers.

Learn the relationship between the radius, diameter, and circumference of a circle.

Learn the relationship between the radius, diameter, and circumference of a circle.

Sal finds several trigonometric identities for tangent by considering horizontal and vertical symmetries of the unit circle.

For each point on the unit circle, select the angle that corresponds to it. Click each dot on the image to select an answer.

What is the unit circle definition of the trigonometric functions? The unit circle definition allows us to extend the domain of sine and cosine to all real numbers.