In this video, the instructor shows the viewer how to find the area of a circle. One example is modeled using a step by step approach walking the learner through the computation. The instructor uses computer software for instruction. Clear, step-by-...step instruction.[more]

When figuring out the perimeter, or circumference, of a circle, the goal is to find the length around the shape. Use the radius and the diameter to figure out the perimeter of a circle with help from this author and teacher. (01:33)

Students learn that the circumference of a circle is the distance around the circle, and the formula for the circumference of a circle is 2 times pi times the radius of the circle. Pi is the ratio of the circumference to the radius, which is approxim...ately 22/7 or 3.14. (02:27)[more]

The perimeter of a circle is calculated by measuring the radius and multiplying it by 2 pi. Calculate the perimeter of a circle with a professional math tutor in this video on math skills. There are English captions at the bottom. (01:07)

This video shows which is longer--the distance around the mouth of the cup (its circumference) or the height of the cup.This is how to trick your parents at a restaurant: circumference is about three times the diameter of a circle.

In this video, using computer software, the instructor discusses how to understand the relationship between the radius, diameter, and the circumference of a circle. (11:05)

The instructor uses a graphics tablet (using different colors for emphasis) to discuss the area of a circle and how it relates to radius and diameter. Several examples of finding the area and circumference of a circle are modeled using a step-by-ste...p approach. (06:45)[more]

Dunk Tank is a math-themed game show created by the producers of Cyberchase and starring Harry from Cyberchase For Real. Using a combination of video and interactive gaming, each program addresses a single topic in the 6th grade math curriculum and s...tudents compete with themselves for high scores. Dunk Tank is an independent learning experience for students to complete in 15-30 minutes, depending on their proficiency, and can also be used to support teacher-led instruction. In this interactive, Harry explains key concepts about circles including: parts of a circle, how to calculate diameter and circumference and pi. Students play Find Tuffy, a mini-game that challenges students to measure and use the radii of circles to find a missing dog; watch a light-hearted video highlighting confusion between a circle’s diameter and its circumference; and answer other questions designed to help them further their understanding of circles. Students can access support using a glossary, defining key math terms, and a menu of short segments to re-watch.[more]

The instructor uses a tablet program to demonstrate how to find the circumference of a circle. The examples include circles where the radius or diameter are given. The instructor also uses a calculator to perform calculations. (06:03)

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