1. Pi, Where does it come from? https://youtu.be/TlY-Sh9Rzas

2. Area of a circle, how to get the formula https://youtu.be/YokKp3pwVFc

3. Surface Area of a Sphere, deriving the formula https://youtu.be/6EzQEdBX_30

4. Volume of a Sphere, How to get the formula animation https://youtu.be/xuPl_8o_j7k

 

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