# Circles

### Popular Tutorials in Circles

#### What is a Circle?

What exactly is a circle? Learn the answer in this tutorial. You can also see the equation for a circle that's on the coordinate plane!

#### How Does the Equation For a Circle Relate to Its Graph?

The standard form equation for a circle can tell you quite a bit about the graph of that circle! Learn more about it with this tutorial.

#### How Do You Determine Whether Two Chords are Equidistant From the Center of a Circle?

When you want to know if two chords are the same distance away from the center of the circle, there's a quick way to get the answer. In this tutorial, you'll learn how to find that answer and figure out which chords are equidistant from the center.

#### How Do You Find The Measure of an Inscribed Angle When You Know the Measure of the Intercepted Arc?

When you're given the measurement of the intercepted arc, you can find the measure of the inscribed angle with a few short steps! Follow along with this tutorial to learn how to find an inscribed angle when you know the intercepted arc!

#### How Do You Use Intersecting Chords to Find Arc Measures in a Circle?

This tutorial shows you how to use your knowledge of intersecting arcs in a circle to find a missing arc measurement. Take a look!

#### How Do You Find the Measure of an Angle Created by Intersecting Chords in a Circle?

This tutorial shows you how to use your knowledge of intersecting chords in a circle to find a missing angle measurement.

#### How Do You Determine Whether a Line is Tangent to a Circle?

In this tutorial, you'll see how the Converse of the Pythagorean Theorem is used to figure out if a line is tangent to a circle.

#### How Do You Find Missing Measures of Angles in Quadrilaterals Inscribed in Circles?

When a quadrilateral is inscribed in a circle, you can find the angle measurements of the quadrilateral in just a few quick steps! Follow along with this tutorial to learn what to do!

#### What is a Tangent Line to a Circle?

What does it mean when a line is tangent to a circle? In this tutorial, you'll learn what a line needs to do to be a tangent line to a circle.

#### How Do You Find the Diameter of a Circle if You Know its Radius?

When you know the radius of a circle, you can find the diameter of that circle with a simple multiplication problem! Follow along with this tutorial to learn how to find the diameter of a circle when you're given the radius.

#### What is a Circle?

Circles are a fundamental part of math! In this tutorial, you'll be introduced to circles and see the different parts of a circle such as the diameter, radius, and chord. Check out this tutorial to learn about circles!

#### What is a Sector and Central Angle?

Just about everything in math has a name! Did you know that a fraction of the area of a circle is known as a sector? This tutorial introduces you to the term sector and gives you examples of sectors. Take a look!