Area of the Rectangle?

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Can you find the Area of this Rectangle without using algebra?

In this video, we using the Tangent-Secant Theorem to simplify this problem.
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A little but of visualisation can turn this complex looking problem into a simple one!

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Can I ask you what software do you use to make this video?!

husamali
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Can you also explain how that theorem works?

HanukDo
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Tangent-secant theorem again!
The short length is 5 and the long length is 20, so their product is 100.
Tangent² = 100, so tangent = 10.

nanamacapagal