# Thread: Finding the one edge of the rectangle

1. ## Finding the one edge of the rectangle

Hello ,

I want to find the rectangle one edge "a" (ie. x and y points of the "a" edge) I know the

rectangle width
rectangle height
and circle mid point
How to find the edge "a" x and y points?

The rectangle will be rotated on the circle , so the rectangle center point always touch the circle boundry. For different positions of rectangle I have to calculate edge "a" x and y points.

2. Originally Posted by kumar
Hello ,

I want to find the rectangle one edge "a" (ie. x and y points of the "a" edge) I know the

rectangle width
rectangle height
and circle mid point
How to find the edge "a" x and y points?

The rectangle will be rotated on the circle , so the rectangle center point always touch the circle boundry. For different positions of rectangle I have to calculate edge "a" x and y points.

Then the vertex A is placed on a circle around C with the radius $R_A = \sqrt{r^2 + \left(\dfrac12 w\right)^2}$