2 Determine the equation of the circle: 2.1 2.3 with centre the origin and radius 7 with centre the origin and passing through point (8;-3) with centre (3;-5) and radius √3 2.4 with diameter CD where C = (0;-3) and D = (2;9) 2.5 with x-intercepts (2;0) and (-4;0) and radius 5 2.6 2.7 2.8 passing through the points (2;3) and (2;-1), with radius √5 passing through points (2;-2); (0;1) and (1; 0) passing through point (-6;1), with circumference 12π and with the centre on the y-axis.