When I was in grade 12, I could do this in a snap. I guess I ain't as smart
as I was 30 years ago...

I have three points equidistant on a circle, spaced 120 degrees apart. They
form an equilateral triangle. I know the length of the legs of the
triangle. How do I determine the diameter (or radius) of the circle?

I have two points on the diameter of a circle. I know the diameter of the circle and the distance between the points. How do I determine the angle between the points?

Lessons in simple trigonometry welcome...:)

Thanks, brian

I have three points equidistant on a circle, spaced 120 degrees apart. They

I have two points on the diameter of a circle. I know the diameter of the circle and the distance between the points. How do I determine the angle between the points?

Lessons in simple trigonometry welcome...:)

Thanks, brian