Radians have the following benefits: They are dimensionless, which means that they can be treated just as numbers (although you still do not want to confuse Hertz with radians per second). Radians give a very natural description of an angle (whereas the idea of 360 degrees making a full rotation is very arbitrary).

Radians make it possible to relate a linear measure and an angle measure. The length of the arc subtended by the central angle becomes the radian measure of the angle. This keeps all the important numbers like the sine and cosine of the central angle, on the same scale.

Should I be in radians or degrees for Trig?

### Why do we use trigonometric ratios?

The trig ratios can be used to find lots of information, and one of their main purposes is to help solve triangles. To solve a triangle means to find the length of all the sides and the measure of all the angles.

### Where are radians used in real life?

Radians are often used instead of degrees when measuring angles. In degrees a complete revolution of a circle is 360◦, however in radians it is 2π. If an arc of a circle is drawn such that the radius is the same length as the arc, the angle created is 1 Radian (as shown below).

Even though you are used to performing the trig functions on degrees, they still will work on radians.

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## What is a radian in simple terms?

Definition of radian : a unit of plane angular measurement that is equal to the angle at the center of a circle subtended by an arc whose length equals the radius or approximately 57.3 degrees.

## Why is it important to know trigonometric ratios in finding the unknown sides and angles of right triangle?

Remember the three basic ratios are called Sine, Cosine, and Tangent, and they represent the foundational Trigonometric Ratios, after the Greek word for triangle measurement. And these trigonometric ratios allow us to find missing sides of a right triangle, as well as missing angles.

The initial parameters of a problem might be in degrees, but you should convert these angles to radians before using them. You should use degrees when you are measuring angles using a protractor, or describing a physical picture. Most people have developed intuitive feel for the common angles.

### Why do we always add the word radians to a circle?

Hence, we always add the word radians to show this ratio. It is better to say that there are “2 π radians” in a circle, rather than just “2 π ” in a circle. The problem with radians is that an angle of one radian is fairly large. In fact, you could estimate it at about 60 degrees, though its true value is about 57.32 degrees.

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