Curated OER
How Do You Find the Area of a Circle if You Know the Radius?
There are basically two things you need to know to find the area of a circle. First, you need to use the correct formula. Second, you have to know the value of the radius. If you know these two things then all you have to do is plug the...
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
What is the Formula for the Area of a Circle?
Cut up a circle and make a parallelogram! What? No way! Yes way! Watch the instructor illustrate just how to cut up the circle and get that parallelogram to then get the formula for the area of a circle. It really works! Base,...
Curated OER
Circumference by Math Busters
The Math Buster goes out and demonstrates a real life example of calculating circumference by walking around the edge of a circle, and compares it to walking from the edge of the circle to the center point. It is a visual demonstration,...
Curated OER
Tangents and Circles - Geometry Help
Does watching a person do a math problem help you understand a mathematical concept? If it does then this clip will be a great help. The tutor in this clip completes a geometry problem involving tangents, circles, and the Pythagorean...
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.
Khan Academy
Khan Academy: Perpendicular Radius Bisects Chord
Proof that if a radius is perpendicular to a chord then it bisects the chord. This video also appears in the Geometry: Circles strand. [6:57]
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 the Formula for the Volume of a Cone?
Tutorial explains the formula for the volume of a cone and shows how to use it in an example. [5:04]
Virtual Nerd
Virtual Nerd: What Is the Formula for the Volume of a Sphere?
In this tutorial, learn how to use a cylinder with the same dimensions to find the formula for the volume of a sphere. [4:56]
Virtual Nerd
Virtual Nerd: Find the Radius of a Circle if You Know the Circumference
Use the formula for the circumference of a circle to find the radius. This tutorial shows you how to use that formula and the given value for the circumference to find the radius. [3:43]
Virtual Nerd
Virtual Nerd: How Do You Find the Radius of a Circle if You Know the Area?
You can use the formula for the area of a circle to find the radius. This tutorial shows you how to use that formula and the given value for the area to find the radius. [3:28]
Virtual Nerd
Virtual Nerd: What Is a Degree?
Watch this tutorial to learn what a degree is and how it relates to a circle. [3:08]
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]
Khan Academy
Khan Academy: Visual Understanding of Centripetal Acceleration Formula
Visual understanding of how centripetal acceleration relates to velocity and radius
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: Calculating the Area of a Circle
Determine the area of a circle with the given formula.
Sophia Learning
Sophia: Calculating the Surface Area of Cones
Students watch a video lesson that demonstrates how to find the total surface area of a cone. The tutorial includes detailed examples. [2:49]
Sophia Learning
Sophia: Determining Unknown Values Using the Volume of a Cylinder
This video lesson demonstrates how to work backwards and use the volume of a cylinder to find an unknown measure such as the radius or height. Students can check their understanding with an assessment. [8:24]
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
Slant height is defined by using pyramids and cones in this video lesson. Assessment given to check for understanding. [5:00]
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]