Elementary Shapes

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Across
  1. 2. Triangle with two equal sides
  2. 5. 3-sided polygon
  3. 6. 4-sided polygon
  4. 8. Less than 90° angle
Down
  1. 1. 90° angle
  2. 3. 3-dimensional shape with 8 vertices
  3. 4. Triangle with all equal sides and angles
  4. 7. parallelogram with each angle being 90°