Perimeter of Squares, Rectangles, and Triangles

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Across
  1. 2. A straight edge of a shape.
  2. 4. How long something is.
  3. 6. A shape with 4 equal sides.
  4. 7. A shape with 3 sides.
Down
  1. 1. How wide something is.
  2. 3. A shape with 4 sides (2 pairs of equal sides).
  3. 5. The distance around a shape.
  4. 8. To combine numbers to make a total.