visualizing solid shapes

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Across
  1. 4. A pyramid with triangle base
  2. 5. solid shapes are three-______
Down
  1. 1. A sketch whre the measurements kept proportional
  2. 2. The corners of a solid shape
  3. 3. flat surfaces of solid shapes
  4. 6. it is the useful way to see how three-dimensional objects can be viewed in two dimensions