Example 1 Find the equation of a circle with radius 3 units and centre (0, 0). The radius, r = 3 and r 2 = 9, so the equation of the circle is x 2 + y 2 = 9.

Keywords mathematical line graph, statistical graphs, variables, distance, time, ordered pairs, linear relationship, first-degree equations, coordinate axes, constant terms, coefficients Email us ...

GCSE OCR Other graphs - OCR The equation of a circle – Higher The most commonly occurring graphs are quadratic, cubic, reciprocal, exponential and circle graphs. Their equations can be used to ...