How To: Cut the moon in ten with only three straight lines

Cutting the moon and making the shape perfectly round is simple.
Usually we have problems drawing a circle free-hand.
In order to draw a perfect circle, we require circle making instruments.
So, a compass would be a good tool to have. It also fits in your pocket.
Now, the mission is to draw a piece of the moon. Keep in mind that we need a perfect piece of moon meaning, a piece for a perfect circle.
First, draw two straight lines that cross each other. Use a piece of paper to draw a line horizontally and then one vertically with both of them crossing each other.
Now, let us make a perfect slab of moon.
Ok, you will now make four marks on the drawing. The top, left, right and bottom. You should end up with four marks, each evenly spaced from the center of the crossed lines.
Now with the compass over the lines you draw a half-circle from the top mark all the way down to the bottom. Now move the compass to the right where you made a mark on the right end of the horizontal line.
You will again put the pencil edge of the compass on the top part of the drawing and draw down to the bottom portion of the drawing.
Erase the crossed lines and you have yourself a perfect slab of perfect moon.