The radius is just the line from the center of the circle. The diameter goes all the way through the center. The circumference is the area around the circle. You find the radius by taking the …

*To find the diameter, measure the circle from its left-right points [divide the circle in half and measure the line you made, make sure the line is straight]. Suppose you get 10in, that is your …

A circle has a circumference of 113.04 units. What is the diameter of the circle? Use 3.14 for π and enter your answer as a decimal.

My question is what is the diameter? The diameter of the circle is equal to what? Just as we said that the circumference could be written as two pi r or as pi times two r, two r is just the …

What is circumference? Circumference is the distance around the outside of a circle (its perimeter!). Want a review of circle vocabulary terms (like pi, radius, and diameter)? Check out …

The area of a circle is pi times the radius squared (A = π r²). Learn how to use this formula to find the area of a circle when given the diameter. Created by Sal Khan and Monterey Institute for …

Another way that we could approach it is we know we have some angles inscribed angles on this circle, and we know that if an inscribed angle intercepts a diameter, then it's going to be a right …

And one way you could think about the diameter is if you have the center of the circle right over here. We have a line segment that goes from one end of the circle through the center to the …

The radius of a sphere is half its diameter. So, to calculate the volume of a sphere given the diameter of the sphere, you can first calculate the radius, then the volume.

We measured the size of the sun (about 1.3 million kilometers) using some basic observations and a little geometry! This illustration shows the approximate size of Earth compared to the …