�已知正三角形的边长为a,其内切圆的半径为r,外接圆的半径为r,r:a:r= ;�已知正方形的边长为a 百度知道 Template




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tomski�已知正三角形的边长为a,其内切圆的半径为r,外接圆的半径为r,r:a:r= ;�已知正方形的边长为a 百度知道 coloring