A circle is the set of points in the plane equidistant from a given point, called the center. A radius is a segment with endpoints at the center and a point on the circle.The circle is defined by its radius and center, so if you know these values, you can write the equation of a circle, and you can also graph it. In this lesson you'll learn about the standard form of the equation of a circle, and how to graph it. Note to use symmetry to help you graph a circle. Review completing the square and do so to put the equation of a circle in standard form.
*These practice questions are only helpful when you work on them offline on a piece of paper and then use the solution steps function to check your answer.
Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.