Start with the circle you see below. Then put the circle on the coordinate system.
Finally, label the circle to show the center and a point on the circle.
Notice that (h, k) is the center of the circle and (x, y) is a point on the circle. The distance between (h, k) and (x, y) is the length of the radius.
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Distance formula = √ | (x_{1} - x_{2})^{2} + (y_{1} - y_{2})^{2} |
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d = √ | (x_{1} - x_{2})^{2} + (y_{1} - y_{2})^{2} |
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r = √ | (x_{1} - x_{2})^{2} + (y_{1} - y_{2})^{2} |
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r = √ | (x - h)^{2} + (y - k)^{2} |
Feb 22, 17 01:53 PM
What is the equation of a circle? How to derive the equation of a circle?
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Feb 22, 17 01:53 PM
What is the equation of a circle? How to derive the equation of a circle?