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.

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

There is a trick to measure the area of a circle. In fact, this was a trick people used in the past to find the area under a curve on a graph (before technology gave us better methods). Suppose I ...

Some algebra will show us why. Since the line has slope 2 and y -intercept 5, we can write its equation as y = 2 x + 5. The equation of the circle is x2 + y2 = 25, so to find the points of ...