Trigonometry Angles and Reference Angles

Flashcards covering key terminology and concepts related to trigonometric angles and their reference angles.

Reference Angle

The acute angle formed by the terminal side of an angle and the x-axis.

Sine of 30 degrees

0.5, or one half.

Quadrant One

The section of the Cartesian plane where both x and y coordinates are positive.

Quadrant Two

The section of the Cartesian plane where x is negative and y is positive.

Quadrant Three

The section of the Cartesian plane where both x and y coordinates are negative.

Quadrant Four

The section of the Cartesian plane where x is positive and y is negative.

Cosine of 60 degrees

1/2, or one half.

Tangent of 30 degrees

1/sqrt(3) or sqrt(3)/3.

Sine of 210 degrees

-1/2 or negative one half.

Sine of 150 degrees

1/2, or positive one half.