# How do you use the reference angle for the unit circle to determine trig values?

## How do you use the reference angle for the unit circle to determine trig values?

Using Reference Angles to Evaluate Trigonometric Functions

1. Measure the angle between the terminal side of the given angle and the horizontal axis.
2. Determine the values of the cosine and sine of the reference angle.
3. Give the cosine the same sign as the x-values in the quadrant of the original angle.

How do you use trigonometry to find reference angles?

Example 6: Using Reference Angles to Find Trigonometric Functions. Use reference angles to find all six trigonometric functions of −585∘ . We need to add 360∘ 360 ∘ until the angle becomes positive. In this case, we needed to add it twice: −585∘+360∘+360∘=135∘ − 585 ∘ + 360 ∘ + 360 ∘ = 135 ∘ .

### What is the measure of the reference angle for a angle?

What is Meant by the Reference Angle? In mathematics, the reference angle is defined as the acute angle and it is measuring less than 90 degrees. It is always the smallest angle, and it makes the terminal side of an angle with the x-axis.

How do you solve reference angles?

Choose a proper formula for calculating the reference angle:

1. 0° to 90°: reference angle = angle ,
2. 90° to 180°: reference angle = 180° – angle ,
3. 180° to 270°: reference angle = angle – 180° ,
4. 270° to 360°: reference angle = 360° – angle .

## What is the measure of the reference angle for a degree angle?

So, if our given angle is 110°, then its reference angle is 180° – 110° = 70°. When the terminal side is in the third quadrant (angles from 180° to 270°), our reference angle is our given angle minus 180°. So, if our given angle is 214°, then its reference angle is 214° – 180° = 34°.

How do you find the reference angle step by step?

How to find the reference angle for degrees

1. Choose your initial angle – for example, 610°.
2. If your angle is larger than 360° (a full angle), subtract 360°. Keep doing it until you get an angle smaller than a full angle. This is the same as finding the modulo.
3. Determine in which quadrant does your angle lie:

### Which is the measure of the reference angle for 227 degrees?

The reference angle is 47°.

What is the formula for an unit circle?

The unit circle formula is: Unit Circle Formula (Equation) x 2 +y 2 =1 . Where x and y are the coordinate values.

## What is the significance of the unit circle?

A unit circle is a circle with a radius of 1, and it is used to show certain common angles . Unit circle: Commonly encountered angles measured in radians and degrees.

What is the sine of a circle?

Verified by Expert. 1) Amplitud: in the unit circle, sine is defined as the length of the vertical projection of the (vetical axis) of the point that defines the angle. Whose maximum value is 1, which is the amplitud of the sine function.

19/06/2020