地球半徑 不錯 Eratosthenes’ Calculation of Earth’s Circumference(JavaLab)、Eratosthenes’ Calculation of Earth’s Circumference 2(JavaLab)
地球半徑 不錯 Eratosthenes’ Calculation of Earth’s Circumference(JavaLab)、Eratosthenes’ Calculation of Earth’s Circumference 2(JavaLab)
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