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# Equations of Circles

## (x - h)^2 + (y-k)^2 = r^2

Levels are CK-12's student achievement levels.
Basic Students matched to this level have a partial mastery of prerequisite knowledge and skills fundamental for proficient work.
At Grade (Proficient) Students matched to this level have demonstrated competency over challenging subject matter, including subject matter knowledge, application of such knowledge to real-world situations, and analytical skills appropriate to subject matter.
Advanced Students matched to this level are ready for material that requires superior performance and mastery.

## Circles

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## Equations of Circles

Derive and use the equation of a circle.
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## Circles

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## SLT 5 Convert an equation of a circle in general form,by completing the square,to standard form

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## Circles

by EPISD Precalculus Team //at grade
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• PLIX

## Equations of Circles: The Sea of Happiness

Equations of Circles Interactive
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• PLIX

## Finding the Equation of a Circle

Equations of Circles Interactive
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• Video

## Equations of Circles - Overview

by CK-12 //basic
Overview
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• Video

## Conic Section - Circles

by Pranav Salunke //basic
This video introduces the concept of a circle in terms of conics. Video Courtesy of: Khan Academy
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• Video

## Circles and Inequalities - Overview

by CK-12 //basic
Overview
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• Video

## Equations of Circles - Example 1

by CK-12 //basic
Write the equation of a circle given a center and radius
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## Equations of Circles - Example 2

by CK-12 //basic
Write the equation of a circle given a center and solution point
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## Equations of Circles - Example 3

by CK-12 //basic
Write the equation of a circle given two endpoints of a diameter
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• Video

## Circles and Inequalities - Example 1

by CK-12 //basic
Graphing Inequalities of Circles
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• Study Guide

## Equations of Circles

by Meera Santhanam //basic
This study guide contains practice with writing equations and graphing circles. It also explains how the circle equation is derived from Pythagorean theorem.
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