Learn the relationship between the radius, diameter, and circumference of a circle.

Learn how the number Pi allows us to relate the radius, diameter, and circumference of a circle.

Solve two challenging problems that apply properties of tangents to find the radius of a circle with a tangent.

Circles are this very fundamental thing in the universe, and you take the ratio of the circumference and the diameter, you get this magical and mystical number that we see that keeps popping up in …

Practice finding the radius and diameter of a circle using both vocabulary and visuals.

A radian is another way to measure angles and arcs based on the idea that 1 radian is the length of the radius. Thus, you are converting line segment (radius) into an arc (radian).

Properties of tangents Learn Proof: Radius is perpendicular to tangent line Determining tangent lines: angles Determining tangent lines: lengths Proof: Segments tangent to circle from outside point are …

When you give a degrees, you really have to do a little bit of math and think about the circumference and all of that to think about how many radiuses are subtending that angle.

Radius, diameter, center, and circumference--all are parts of a circle. Let's go through each and understand how they are defined. Created by Sal Khan and Monterey Institute for Technology and …

Circle basics Learn Circles glossary Radius, diameter, circumference & π Proof: all circles are similar