The equation of a circle can be found using the centre and radius. The discriminant can determine the nature of intersections between two circles or a circle and a line to prove for tangency.

1. Understand the equation of a circle: The equation of a circle is given by (x – h)^2 + (y – k)^2 = r^2, where (h, k) are the coordinates of the center of the circle and r is the radius. 2. Determine ...

GCSE Eduqas Other Graphs - Eduqas The equation of the tangent to a circle - Higher The most commonly occurring graphs are quadratic, cubic, reciprocal, exponential and circle graphs.

The top part of that image is the equation itself. The bottom part is a graph of the equation, which, as you can see, is exactly the same. To be fair, this equation cheats a little bit.

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