# Homework 4 the unit circle

To define our trigonometric functions, we begin by drawing a unit circle, a circle centered at the origin with radius 1, as shown in Figure 2. Recall that the x- and y- axes divide the coordinate plane into four quarters called quadrants. We label these quadrants to mimic the direction a positive angle would sweep. Figure 2. Like all functions, the sine function has an input and an output. Its input is the measure of the angle; its output is the y -coordinate of the corresponding point on the unit circle.

## Unit 10 Circles Worksheets - Learny Kids

Homework is easy with expert tips and advice. And even easier when you have an expert to do it for you. That is one of the most important mathematical tools for helping you to easily solve for cosine, sine, or tangent of an angle. But how does the unit circle work?

### What does the unit circle tell us? (Day 2 of 2)

The Unit Circle is probably one of the most important topics in all of Trigonometry and is foundational to understanding future concepts in Math Analysis, Calculus and beyond. Well, the Unit Circle, according to RegentsPrep, is a circle with a radius of one unit, centered at the origin. If the radius is a length of 1, then that means that every Reference Triangle that we create has a hypotenuse of 1, which makes it so much easier to compare one angle to another. But, the Unit Circle is more than just a circle with a radius of 1; it is home to some very special triangles.
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