Solution to the game with three circles.

作者：Doru Paunescu

Three blue circles with the same radius R meets two by two in A1, A2 respectively in A3. The red circle circumscribed to the triangle A1A2A3 has the same radius R iff the blue circles have a common point.

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vectori
Aria triunghiului
piramidă
Inaltimea triunghiului
Dreaptă perpendiculară pe un plan

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參數曲線
二次函數
角度
正切線或正切
幾何變換

Solution to the game with three circles.

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