A circle, radius two units, center the origin , cuts the x-axis at A and B and cuts the positive y-axis at C. Prove that AB subtends a right angle at C.
I have tried drawing it so i can understand the problem better in order to answer the question. but looking at the sketch. It creates an isosceles
triangle not a right angle
I have tried a different sketch;
the problem with this sketch is that c is not the positive y-axis.
any tips so i can figure it out