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National Parks Service
Yosemite Nature Notes 11: Big Trees
Most of Yosemite National Park is blanketed with vast forests, and with abundant precipitation and warm temperatures, these mountains are home to the largest trees in the world.
Professor Dave Explains
Zooming Out From Earth to the Edge of the Observable Universe
We all know that the universe is big. But how big it is? Much bigger than you think. Let's start out by looking at the Earth, and then zoom out to progressively larger and larger structures, so that we can see just how big it is. Then...
Tarver Academy
Circumference and Area of a Circle
In This Episode, Tyler Teaches Us About The Circumference and Area of a Circle
Curated Video
Finding the Constant of Proportionality from Labeled Diagrams
In this video, the teacher explains how to identify the constant of proportionality from labeled diagrams. They provide examples of circles with their circumference and diameter labeled in nanometers.
Visual Learning Systems
Our Galaxy and Stars: Stars
This captivating series of programs explores many of the amazing features of our universe. Special attention is given to our solar system, distances in space, and stars. Terminology and concepts include: Milky Way Galaxy, light-year,...
Curated Video
Solving Equations and Formulas: Finding Missing Values
In this video, the teacher explains how to solve for missing values in formulas by inputting variable values and using inverse operations. The examples given include finding the diameter of tires, solving for the height of a rectangular...
Odd Quartet
The Oldest Music on Earth
While excavating the Hohle Fels cave in southwestern Germany in 2008, scientists discovered a bone flute that turned out to be one of the oldest music instruments in the world. In this episode we take a closer look at the flute itself...
Visual Learning Systems
Exploring Earth, Sun, and Moon: Earth's Moon
Upon viewing the Exploring Earth, Sun, and Moon video series, students will be able to do the following: Cite some of the characteristics of Earth which make it unique in our solar system, including: Earth's moderate temperature, the...
Visual Learning Systems
The Amazing Universe: Stars
This show explores the fascinating features of the universe, the different types of galaxies in our solar system and the position of our solar system in the Milky Way Galaxy. Other terminology includes: constellations, spiral galaxy,...
Professor Dave Explains
Circles: Radius, Diameter, Chords, Circumference, and Sectors
Calculations involving circles.
Curated Video
Finding the Area of a Circle
This video explains how to find the area of a circle by relating it to a rectangle. Review the concept of area and the order of operations. Using visual aids, they demonstrate how to convert a circular shape into a rectangular shape to...
Jam Campus
Circle Song
Learn the area, diameter, and circumference of a circle through song! A great way to boost classroom engagement when introducing new topics.
Curated Video
Finding the Circumference of a Circle
In this video, the teacher explains how to find the circumference of a circle by exploring the ratio of the diameter and circumference. The concept of constant proportionality and the use of pi as an approximate value are also discussed.
Curated Video
Proving the Circumference Formula of Circles
In this video, the teacher explains how to prove the formula for the circumference of a circle by dissecting the circle and making comparisons. The students are guided through the process of unrolling the circle to see how the...
Curated OER
Circles: Radius, Diameter and Circumference
Fascinating discussion regarding the origin of Pi accompanies a detailed explanation of how to find the circumference of a circle. Since this is the first installment in a series on circles, the concept of circumference is separated into...
Khan Academy
Area of a Circle, Perimeter, Area, and Volume, Geometry
This production, the second installment in a series of circles, demonstrates the process of finding the area of a circle. It is effective as an introductory tool. However, it needs to explain the reasoning behind the formula because that...
Khan Academy
SAT Prep: Test 1 Section 3 Part 4
Pushing through to problems 11-12 on page 398 of The Official SAT Study Guide, Sal goes into comprehensive detail on each problem. Problem 11 involves geometry, including the function of pi, and problem 12 involves non-constant slopes....
Khan Academy
SAT Prep: Test 3 Section 2 Part 3
Math speeds along in this video, which takes students through problems 11-15 on the practice SAT. Sal takes care to show students more than one possible way to solve several problems, allowing them to make the choice based on their own...
Khan Academy
SAT Prep: Test 4 Section 4 Part 1
The next section of the practice SAT from The Official SAT Study Guide (page 594) covers simple linear equations and geometric figures. Students will appreciate Sal's quick problem solving and thought process, which is easy to understand...
Khan Academy
SAT Prep: Test 3 Section 8 Part 2
Problems 7-9 involve exponents, inequalities, and geometric figures (diameter and radius), all of which Sal explores eagerly. After misreading one problem, he takes care to correct his mistake, showing students how important it is to...
Khan Academy
Test 3 Section 2 Part 5
Both algebra and geometry problems are featured in this SAT practice video. Students who struggle to transition between skills on tests (average mean, then diameters and pi, then positive integers) would benefit from Sal's deft handling...
Flipped Math
Circles and Arc Lengths
Discuss all things round and round. Pupils review finding area and the circumference of circles and use them to solve problems. Next, they learn about central angles and their relationships to measures of arcs. Learners then find out how...
PBS
Pi Day | All About the Holidays
Pi day is both delicious and informative! Play a short video on Pi Day to explain the basics behind both the holiday and the infinite number.
PBS
Formulas for Circle Area and Circumference: Simple as Pie
Calculating circumference is as easy as pi times diameter. A short video explains how to measure pie tins using the diameter. It also describes the relationship between diameter and circumference. Using the knowledge, scholars consider...