Circle geometry lesson 1 with Geogebra

2,044 views · Published 6 August 2013 · 5:25 · Indexed 6 November 2026

Channel: Magic Monk · 2013 · Education

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In this lesson we use Geogebra to show you why the angle subtended by the diameter in a circle will always be 90 degrees (also known as angle in a semi circle is 90 degrees).
We also explain the term "subtend".

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