PCH 4.1 - 4.4 (TRIG REVIEW)

Front

What are the coordinates of points on the unit circle?

Back

The coordinates of points on the unit circle are given by (cos(θ), sin(θ)).

Front

How do you convert degrees to radians?

Back

To convert degrees to radians, use the formula: radians = degrees × (π/180).

Front

What is a coterminal angle?

Back

Coterminal angles are angles that share the same terminal side. To find a coterminal angle, add or subtract 360° (or 2π radians) from the given angle.

Front

What is the degree measure of -590°?

Back

-590° is coterminal with 130° (by adding 720°).

Front

How do you round a number to the nearest tenth?

Back

To round to the nearest tenth, look at the hundredths place. If it's 5 or more, round up; if it's less than 5, round down.

Front

What is the sine of an angle in the unit circle?

Back

The sine of an angle θ in the unit circle is the y-coordinate of the point on the circle corresponding to that angle.

Front

What is the cosine of an angle in the unit circle?

Back

The cosine of an angle θ in the unit circle is the x-coordinate of the point on the circle corresponding to that angle.

Front

How do you find the reference angle for an angle?

Back

The reference angle is the acute angle formed by the terminal side of the given angle and the x-axis. For angles greater than 360°, subtract 360° until you get an angle between 0° and 360°.

Front

What is the formula for finding the tangent of an angle?

Back

The tangent of an angle θ is given by tan(θ) = sin(θ)/cos(θ).

Front

How do you find the angle in radians for a given angle in degrees?

Back

To find the angle in radians, multiply the degree measure by π/180.