Geometry

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Across
  1. 5. quadrilateral, four right angles, opposite sides must be same length
  2. 6. Shapes that have 4 sides
  3. 8. The measurement or distance around the outside of an object.
  4. 9. Quadrilateral, parallelogram, no right angles, all equal sides.
Down
  1. 1. polygon with 3 sides
  2. 2. same shape, same size
  3. 3. quadrilateral, one set of parallel sides.
  4. 4. polygon with 4 equal sides and 4 right angles.
  5. 7. The measurement of the inside surface of an object.