PBS
To Scale: The Solar System
To scale, or not to scale ... that is the question! Show scholars the solar system in correct proportion with a lesson from PBS's Space series for middle school. Two versions of the model-building exercise illustrate the planning process...
CK-12 Foundation
Circumference: Lesson
It all depends what is given. The section of a large geometry playlist discusses the two formulas for finding the circumference of a circle. With the aid of the formulas, the presenter demonstrates finding the distance around circles in...
CK-12 Foundation
Parts of Circles: Lesson
Start off with the basic parts. The section of a larger playlist covering essential geometry concepts identifies and provides the definitions of the basic parts of a circles. Using drawings, the video illustrates the different parts and...
Numberphile
Calculating Pi with Real Pies
Pie is great for finding pi. A short video shows how to use real pies to calculate pi. The method involves laying out pies along the circumference and along the diameter of a circle, and then finding the ratio of the number of pies.
Math Antics
Circles, What Is Pi?
Understanding the basic of circles is as easy as pi. The resource introduces the definition of a circle along with its dimensions, circumference, diameter, and radius. Using graphics, the video shows the approximation of pi and how to...
Mathed Up!
Area and Circumference of Circles
Don't go around and around, help your class determine amounts around and in a circle with a video that connects circumference to the perimeter or the distance around an object. The resource includes 14 questions dealing with circles and...
Krista King Math
Circumference of a Circle
Apple, cherry, pecan, or circumference: so many different uses for pi! Delve into the calculations relating to the circumference of a circle. The instructor applies the circumference formula to three different types of problems.
Curated OER
What is a Circle?
A circle is a set of all the points that are equal distance from a center point. Learn the definition of some of the terms that are associated with a circle: diameter, radius, chord.
Curated OER
What is a Sphere?
The teacher diagrams and explains the different terms of what comprises a sphere. Follow along and learn about the: radius, diameter, great circle, center, and hemisphere.
Curated OER
What is a Sphere?
The teacher diagrams and explains the different terms of what comprises a sphere. Follow along and learn about the: radius, diameter, great circle, center, hemisphere
Corbett Maths
Parts of the Circle
Before you can do anything with circles, you need to know the parts of the circle. Viewers of a short video see how to label relevant information about a circle. The resource covers radius, diameter, circumference, chord, tangent, arc,...
Curated OER
What is Circumference?
There are actually two formulas to find the circumference of a circle. One formula is based on knowing the diameter of the circle, and the other is based on knowing the radius of the circle. The instructor illustrates both formulas. She...
Curated OER
How Do You Find the Circumference of a Circle if You Know the Diameter?
There are two formulas that can be used to find the circumference of a circle. Choose the appropriate formula depending on the given value in the problem. After selecting the correct formula, solve the problem using 3.14 as an estimation...
Curated OER
How Do You Find the Area of a Circle if You Know the Diameter?
Do you know the formula to find the area of a circle? Do you know the value of pi? Do you know what the relationship is between diameter and radius? Yes? Then you can solve this problem. If your scholars don't know this formula then this...
Curated OER
Radius, Chord, Diameter, and Secant
What do a secant, chord, diameter, and radius all have in common? They are all components or measurements of a circle! This clip quickly defines each of these terms using verbal, written, and diagram examples.
Curated OER
STEMbite: Circumference Mystery
Middle school mathematicians might be able to follow as Mr. Vander Heuvel explores the relationship between circumference and diameter. The mystery comes in when he uncovers that for every increased increment of one unit in diameter, the...
Khan Academy
Khan Academy: Geometry: Language and Notation of the Circle
Formally defines a circle and different parts of a circle. Identifies the proper notation for naming different parts of a circle. [11:12]
Sophia Learning
Sophia: Converting Between Diameter and Radius: Lesson 3
Given this lesson and either the diameter or radius of a circle, you'll be able to calculate the other measure. It is 3 of 10 in the series titled "Converting Between Diameter and Radius." [2:06]
Virtual Nerd
Virtual Nerd: What Is Circumference?
The circumference of a circle is the distance around that circle. Take a look at this tutorial to discover the formulas for the circumference of a circle. [4:22]
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
This video tutorial demonstrates how to find the area of a circle. The lesson includes detailed examples.
Sophia Learning
Sophia: Parts of a Circle
Explore the parts of a circle then test your knowledge with a quiz.
Sophia Learning
Sophia: Slant Height of a Cone
This video lesson demonstrates how to find the slant height of a right cone. Students can check their understanding with an assessment. [6:18]
Sophia Learning
Sophia: Spheres: Volume and Surface Area
This video tutorial demonstrates how to calculate the volume and surface area of a sphere. The lesson includes four videos with detailed examples using the formulas for volume and surface area. [Video tutorial lengths total 17:16]