There is something I don't understand about the volume of the icosahedron.
Answered
Hello! I am a Korean who uses a translator. To get to the point, I know that the method of calculating the volume of the icosahedron is usually derived by dividing the icosahedron by 20 equilateral triangular pyramids. Also, we are currently using the formulas that came out like that. But there is one thing I don't understand here. It's the same shape, but it's true that the value calculated by dividing it by 20 equilateral triangular pyramids is different from when using the formula!! At first I saw it, and I didn't understand it, so I talked to the GeoGebra staff, but they also told me that the price was different. If anyone knows the reason for this phenomenon, please let me know!! As soon as possible haha
The same question 
If you divide an icosahedron into 20 pyramids then they are NOT equilateral
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