This equation is the same as the general equation of a circle, it's just written in a different form. Example Find the equation of the circle with centre \((2, - 3)\) and radius \(\sqrt 7\).

The most commonly occurring graphs are quadratic, cubic, reciprocal, exponential and circle graphs. Their equations can be used to plot their shape. Part of Maths Algebra.

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

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).