If the radius is known:

How to draw a diameter circle. So it's essentially two radii. We can calculate the diameter by multiplying the radius by 2: And here is the really cool thing:

So that is the diameter of the circle. Web how to measure the diameter of a circle? We call this distance along the widest point of the circle, the diameter.

When we divide the circumference by the diameter we get 3.141592654. Web draw circles given the radius or diameter. To create a “chord,” draw a line through the circle.

A ruler or tape measure. That way, you won’t have a hole in the top. Drawing circles will be a breeze once you find the method that works for you!

Web a chord that passes through the center of the circle is a diameter of the circle. This calculator will automatically estimate all of the other values. Tap on the create a new map button at the top.

If doing this for a table top or tray, put the screw or nail in the bottom side and don’t go all the way through. As you learned above in the first section, the radius is one half of the diameter. Web if the circumference of the circle is 10 cm, then the diameter is 10 cm/π, or 3.18 cm.