# Unit Circle Chart Trig

**Unit Circle Chart Trig** – Hello and welcome to this unit cycle review! In this video we will go through what the unit circle is and what it is used for.

Before we get into the unit circle itself, let’s talk about degrees and radians. Most of the time, when you measure an angle, you measure it in degrees. For example, a right angle has 90 degrees, a right angle has 180 degrees, and there is an angle for every number in between.

## Unit Circle Chart Trig

But there is actually another way you can measure an angle, and that is by measuring in radians. Measurement in radians relates the angle to (pi ), so almost all angle measurements will have (pi ) when measuring in radians.

#### Unit Circle Paper Plate Activity

Since (pi ) is the ratio of a circle’s circumference to its diameter, it makes sense that we most often use radians when working with circles.

A unit circle is a circle with a radius of one unit and its center at the origin. This might seem pretty common and you might get excited if you think I’m going to ask you to find the perimeter or area. With a radius of one, it wouldn’t be very difficult. But today we’re going to look at this circle through the lens of trigonometry.

Trigonometry is the study of how the sides and angles of a triangle relate to each other. Now you’re probably wondering what circles and triangles have to do with each other, and that’s a good question! One of the most common uses of trigonometry is to find the measures of an angle given two sides of a right triangle. If we look closely at our circle, we can find right triangles in it. Here is an example:

## Unit Circle Labeled At Special Angles

We know the radius is 1, and we can use SOHCAHTOA to find that the opposite is (frac) and the adjacent side is (sqrt).

An important thing to note when discussing these angle measurements is that the angles must be in a standard position. Simply put, standard position means that the vertex of the angle is at the origin of the circle and that a ray of the angle is on the positive (x) axis. The second ray of the angle is placed on the angle measure formed by moving counter-clockwise along the circle. If an angle is not in default position, it is important to place it in default position before using the points to find your trig values.

I want you to try to find one or two trigger values on your own using the unit circle. For now we’ll put it on the screen so you can refer back to it, but eventually you might want to remember it as these values come up a lot in math.

## Fill In The Blank Unit Circle Chart

We can solve this by multiplying 180 degrees by the conversion factor (frac}}). This simplifies to π rad.

The coordinates of the points on the unit circle represent the cosine and sine of the angle, respectively. We will look for the coordinates where the ratio (frac=frac}). The

The coordinates of a point on the unit circle represent a cosine. Find (frac), which corresponds to 240° in the coordinate (-frac, -frac})). The x-coordinate of the point is (-frac) and the cosine (frac).

### Trigonometry Definitions And Functions

Since we are told that the value of Ɵ is in the first quadrant and we know that

The coordinate of a point on the unit circle represents a sine, we can look for a point on the unit circle where the unit circle can be used to define right triangle ratios called sine, cosine, and tangent. © HowStuffWorks 2021

You probably have an intuitive idea of what a circle is: the shape of a basketball hoop, a wheel, or a quarter. You may even remember from high school that the radius is any straight line that starts from the center of the circle and ends at the circumference.

### What Is A Unit Circle?

A unit circle is simply a circle that has a radius of length 1. But often it comes with some other bells and whistles.

A unit circle can be used to define right triangle ratios known as sine, cosine, and tangent. These relationships describe how the angles and sides of a right triangle relate to each other. For example, let’s say we have a right triangle with a 30-degree angle, and its longest side, or the hypotenuse, has a length of 7. We can use our predefined triangle ratio to calculate the lengths of the two remaining sides of the triangle. . .

This branch of mathematics, known as trigonometry, has practical everyday applications such as construction, GPS, diving, video games, engineering, carpentry and aircraft navigation.

## Graphing Trig Functions: Algebra 2/trig.

To help us out, we’ll remember a trip to Unit Pizza Palace. Take a few minutes to memorize the following until you can recite it without looking:

Imagine a whole pizza, cut into four even slices. In mathematics, we will call these four parts of the circle quadrants.

Fig. 2. Unit circle with quadrants added. Quadrant 1 is top right, quadrant 2 is top left, quadrant 3 is bottom left, and quadrant 4 is bottom right.

#### Interactive Unit Circle

We can use coordinates (x, y) to describe any point along the outer edge of the circle. The X coordinate represents the distance traveled to the left or right of the center. The Y coordinate represents the distance traveled up or down. The x-coordinate is the cosine of the angle formed by the point, the origin and the x-axis. The Y coordinate is the sine of the angle.

In a unit circle, a straight line running to the right of the center of the circle will reach the edge of the circle at the coordinate (1, 0). If we instead went up, left or down, we would touch the circumference at (0, 1), (-1, 0) or (0, -1) respectively.

The four related angles (in radians, not degrees) have a denominator of 2. (A radian is the angle made by taking the radius and wrapping it around a circle. A degree measures angles by distance traveled. A circle is 360 degrees or 2π radians).

## Trigonometric Unit Circle Chart Mathematics Stock Vector (royalty Free) 2073018599

The counters start at 0, start at the coordinate (1, 0), and count counter-clockwise by 1π. This process will produce 0π/2, 1π/2, 2π/2 and 3π/2. Simplify these fractions to get 0, π/2, π and 3π/2.quad

Start with “3 pies.” Look at the y-axis. The radian angles immediately to the right and left of the y-axis have a denominator of 3. Each remaining angle has a numerator containing the mathematical value pi, written as π.

“3 pie for 6” is used to recall the remaining 12 angles in a standard unit circle, with three angles in each quadrant. Each of these angles is written as a fraction.

#### Printable Unit Circle Charts & Diagrams (sin, Cos, Tan, Cot Etc)

“For $6” is a reminder that the remaining denominators in each quadrant are 4 and then 6.

In quadrant 2 (upper left quarter of the circle), put 2, then 3, then 5 in front of π.

Your first angle in quadrant 2 will be 2π/3. Adding 2 to the numerator and 3 to the denominator will add up to 5. Look at the right angle across in quadrant 4 (lower right quarter of the circle). Put this 5 in the counter in front of π. Repeat this process for the other two angles in quadrants 2 and 4.

### Unit Circle Calculator

We will repeat the same process for quadrants 1 (top right) and 3 (bottom left). Remember that just as x is the same as 1x, π is the same as 1π. So we add 1 to all the denominators in quadrant 1.

The process for listing angles in degrees (instead of radians) is described at the end of this article.

The “2” in “2 square tables” is a reminder that each of the remaining 12 coordinate pairs has a denominator of 2.

## Unit Circle Chart

“Square” is to remind us that the numerator of each coordinate contains a square root. We’ll just start with quadrant 1 to simplify things. (Hint: Remember that the square root of 1 is 1, so these fractions can be simplified to just 1/2.)

“1, 2, 3” shows the sequence of numbers under each square root. For the x-coordinates of quadrant 1, we count from 1 to 3, starting at the highest coordinate and working our way down.

The Y coordinates have the same counters, but they count from 1 to 3 in the opposite direction, from bottom to top.

## Solved How Do You Fill In A First Quadrant Chart?

Quadrant 3 changes the x and y coordinates from quadrant 1. All x and y coordinates are also negative.

Like quadrant 3, quadrant 4 also swaps the x and y coordinates of quadrant 1. But only the y coordinates are negative.

You may want to enter angles in degrees instead of radians. To do so, start at 0 degrees at coordinate (1, 0). From there, we add 30, 15, 15, and then 30. In quadrant 1, we add 30 to 0 to get 30, add 15 to 30 to get 45, add 15 to 45 to get 60, and adding 30 to 60 to get 90 .

#### Graph And Formula For The Unit Circle As A Function Of Sine And Cosine

Then we repeat the process for the remaining quadrants, adding 30, 15, 15, and 30 until we reach the end of the cycle. So the angles of quadrant 4 will vary from 270 to 330 degrees (see figure

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