Circles+Lesson

 **CIRCLES**



This week we will be focusing on the different properties of a circle.

A **__circle__** is a plane figure, bounded by a single curve line (circumference), every part of which is equally distant from a point within it called its center.



Within this diagram of a circle, we can see several other aspects labeled. Here are a few definitions you should know.

The **__diameter__** of the circle is the length of the line segment whose endpoints lie on the circle and which passes through the center. The diameter is the longest distance between any two points on the circle.

The common distance of the points of a circle from its center is called **__radius__**.

The perimeter or length of the circle is known as its __**circumference **__.

Other important pieces of a circle are shown in the diagram below.



An __**arc**__ of a circle is any connected part of the circle's circumference.

A __**sector**__ is a region bounded by two radii and an arc lying between the radii.

A __**segment**__ is a region bounded by a chord and an arc lying between the chord's endpoints.

This is only a brief overview of circles. As you become more comfortable with the terminology, we will start doing computations dealing with circles. To introduce you to the ideas that we will be going over in the coming weeks, I have posted a very informative video below for you to watch.

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