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
Measuring Arc Length: Lesson
Slice off a piece of pi! A section of an extensive playlist on geometry develops the formula to find the length of an arc. Using the formula, the presentation works through examples finding the arc length, the radius, and the measure of...
Numberphile
Tau vs Pi Smackdown
Who wins the tau vs pi debate? Two mathematicians share their view of whether tau or pi is better in a video from the Numberphile Pi series. Spoiler alert: Pi wins.
Numberphile
Pi and Four Fingers
The Simpsons isn't the most likely television show to teach your scholars about math—but it does! An engaging video in the Numberphile "Pi" series explains some math concepts that arise in the show. It also explains some historical...
Numberphile
Pi Prog Rock
Make music using math. Young mathematicians listen to a musical score in a video from the Numberphile Pi series. It turns out that the music in the video has all sorts of connections to pi and tau.
Numberphile
Pi Me a River
What do rivers have to do with pi? Scholars view a video in the Numberphile Pi playlist that explains how pi relates to the sinuosity of rivers. On average, dividing the meandering length of the river by the straight-line...
Numberphile
Pi and the Size of the Universe
How many digits of pi would you need to accurately express the circumference of the universe? A mathematician attempts to answer this question in a Numberphile "Pi" video. It turns that only 39 digits are necessary to determine the...
Numberphile
Pi and the Mandelbrot Set
Pi shows up in a lot of places, even in the complex plane. Individuals watch a video in the Numberphile Pi series that shows the Mandelbrot set in the complex plane and explains how pi shows up in the number of iterations.
Numberphile
Pi Is Beautiful
Who knew you could use pi to create beautiful art? Scholars see how they can use the digits of pi to create art. The video in the Numberphile Pi series explores some examples of this type of art.
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.
Numberphile
Pi and Bouncing Balls
Don't drop the ball—use a unique resource to teach your class even more about pi! Given a situation about balls bouncing off each other, viewers see how many bounces it takes for the larger ball to move in the other direction. This...
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...
PBS
When Pi is Not 3.14
Isn't pi supposed to be constant? An intriguing video shows how the value of pi can change when the definition of distance varies. It explains how using various L^p metrics, where p = 2 represents the traditional Euclidean metric,...
Krista King Math
Area of Circles
Show your classes how exciting it can be to solve a complex problem. The instructor in the video shows how to apply the formula for the area of a circle to finding the area of complex images.
Curated OER
Circumference of Circles
In this comprehensive video Duane demonstrates how to use a formula to determine the circumference of a circle. This clip is good because it shows how to determine circumference when the diameter is knows and when only the radius is known.
Curated OER
What is the Formula for the Volume of a Sphere?
The formula of a sphere is related to the formula of a cylinder? How? Oh, radius and pi. Watch this video and observe how the instructor illustrates just how these two formulas are connected. Then plug in the known values and solve this...
Curated OER
How Do You Find the Lateral and Surface Areas of a Cone?
The lateral surface area of a cone. Hmmm, what does that mean? Oh, it means the part you see if the cone was sitting on a flat surface, so it does not include the base. But if you want to include the base then it would be finding the...
Curated OER
Common Angle Measures
Using a circle with clock like hands, the tutor explains common angle measurements. She shows that a full circular rotation equals 360 degrees, a quarter rotation equals 90 degrees, a three-quarters rotation equals 270 degrees, and a...
Curated OER
What's an Irrational Number?
This video defines rational numbers. Through the definition and examples, learners should comprehend that irrational numbers are numbers that cannot become simple fractions. The video uses examples of very common irrational numbers, such...
Curated OER
What is the Formula for the Volume of a Cone?
All you need are a few values to find the the volume of a cone! Watch an informative math video that guides learners through the formula needed, as well as the relationship between the cone's volume and the volume of other...
Curated OER
How Do You Find the Volume of a Sphere?
The formula for the volume of a sphere is - volume equals four thirds pi times the radius cubed. That's a mouth-full. But if you are given the radius value of the sphere, all you have to do is plug it in and do the arithmetic. Just...
Curated OER
How Do You Find the Area of a Sector of a Circle?
How do you find the area of a sector of a circle? Use the formula of course. Then all you have to do is plug in the given values and do the math. Make sure you are following the rules of order of operation. The instructor will walk you...
Numberphile
Tau Replaces Pi
If it ain't broke, don't fix it? Young mathematicians learn about the advantages of replacing pi with tau, such as a more conceptual understanding of radian measure. The video in the Numberphile Pi series also explains why such a move...
Numberphile
Pi
Behind every number is a good story. Scholars learn how Archimedes tried to estimate the value of pi through inscribed and circumscribed figures. Viewers also see how they can use infinite series to find the value of pi by watching a...