称之为四面体不严谨。 所求小球的半径为 (1.50.5-1)r。 |
4 balls have many ways to form a volume. Do you mean 3 on the bottom and 1 on the top? |
即四球相互外切。 |
There are many ways for 四球相互外切. That 3 on the bottom and one on the top is this problem. |
是的,要每一个球都与另三个球相切,只有一种方式。 |
You are right. I have a link to show it but I forgot. |
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