Unit 2 Review - Unit Circle & Rt Tri Trig

Front

What is the Unit Circle?

Back

The Unit Circle is a circle with a radius of 1 centered at the origin (0,0) in the coordinate plane. It is used to define trigonometric functions for all angles.

Front

What is the sine function?

Back

The sine function, denoted as sin(θ), is a trigonometric function that represents the ratio of the length of the opposite side to the hypotenuse in a right triangle.

Front

What is the cosine function?

Back

The cosine function, denoted as cos(θ), is a trigonometric function that represents the ratio of the length of the adjacent side to the hypotenuse in a right triangle.

Front

What is the tangent function?

Back

The tangent function, denoted as tan(θ), is a trigonometric function that represents the ratio of the sine to the cosine: tan(θ) = sin(θ)/cos(θ).

Front

How do you find a coterminal angle?

Back

To find a coterminal angle, add or subtract multiples of 2π (or 360°) to the given angle.

Front

What is the value of sin(π/6)?

Back

sin(π/6) = 1/2.

Front

What is the value of cos(π/3)?

Back

cos(π/3) = 1/2.

Front

What is the value of tan(π/4)?

Back

tan(π/4) = 1.

Front

What is the reference angle for 7π/6?

Back

The reference angle for 7π/6 is π/6.

Front

What is the value of sin(7π/6)?

Back

sin(7π/6) = -1/2.