如图已知正方体棱长为2点是正方形的中心点分别是棱的中点.设点分别是点在平面内的正投影. Ⅰ求以为顶点以四边形在平面内的正投影为 Template




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tomski如图已知正方体棱长为2点是正方形的中心点分别是棱的中点.设点分别是点在平面内的正投影. Ⅰ求以为顶点以四边形在平面内的正投影为 coloring