Question

Condition for four points to be concyclic

Answer 1

a _________________ b


let C and D, be two points either side of the line AB, with the condition that are at equidistant with the line AB,

so that Angle (ACB) = Angle (BDA)

keep it in mind that C and D are different points, but makes equal angle,

please join the points AC, BC, AD, BD
the theorum tells that all these points A, B, C, D will be concyclic, it means it will be on the same circle

Regards