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Circumference - Perimeter of circles made easy - fast math lesson.

tecmath 103,879 12 years ago
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It is easy to convert work out the perimeter of a circle - using pi, radius and diameter. To donate to the tecmath channel:https://paypal.me/tecmath To support tecmath on Patreon: https://www.patreon.com/tecmath To buy tecmath mechandise: https://teespring.com/stores/tecmath-store

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