Geometry

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Across
  1. 3. Stick
  2. 4. Not-Crossing-Ever
  3. 5. Unbending
  4. 6. Vertices
Down
  1. 1. Flat-Like-The-Horizen
  2. 2. 80-Degrees
  3. 4. A-3d-Shape-with-a-base-meeting-at-one-point