Find the Center
You want to place a point at the center of a round piece of paper, but you aren't sure where that is.
You have a pencil and a rectangular piece of paper.
How can you find the exact center of the circle?
Use the corner of the paper to draw a right angle with its vertex on the circle.
Connect the two intersections of the angle's rays with the circle. That is the circle's diameter.
Repeat this to create a new diameter from a different angle.
The intersection of the two diameters will be the center of the circle.
