Khan Academy
Khan Academy: Geometry: Parts of a Circle
Identifies and labels basic parts of a circle: center, diameter, radius, and circumference. This video also appears in the Geometry: Circles strand. [2:01]
Sophia Learning
Sophia: Calculating the Area of a Circle
Determine the area of a circle with the given formula.
Khan Academy
Khan Academy: Circumference and Area of Circles
Understanding the relationship between the radius, diameter, and circumference of a circle.
Khan Academy
Khan Academy: Introduction to Euclidean Geometry: Language of the Circle
In this video student learn formal definition of a circle including tangent and secant lines, diameters, radii, major and minor arcs.
Khan Academy
Khan Academy: Circumference and Area of Circles: Area of a Circle
This video will show you how to solve problems dealing with the area of a circle.
Loyola University Chicago
Math Flix: Area of a Circle Using the Formula
This QuickTime movie provides an opportunity to learn how to use the formula to find the area of a circle. As you watch and listen to the teacher and student interact it helps clarify the thinking behind applying this concept.
Art of Problem Solving
Art of Problem Solving: Funky Area
Video tutorial shows how to calculate the area around a circle that is inside a square. [4:22]
Khan Academy
Khan Academy: Ca Geometry: Pythagorean Theorem, Area
36-40, Pythagorean Theorem and area.
Khan Academy
Khan Academy: Ca Geometry: Area, Pythagorean Theorem
26-30, area, circumference, pythagorean theorem.
Khan Academy
Khan Academy: Ca Geometry: Area, Circumference, Volume
Geometry video with a focus on area, circumference and volume.
Shmoop University
Shmoop: Attributes of Circles
This video explains circumference, radius and diameter in an appealing way for students to understand.