Triangles

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Across
  1. 3. an opposite of a squared number
  2. 5. sum of all sides of the triangle
  3. 6. Triangles with 2 equal sides
  4. 7. counting the number of square spaces inside the triangle
Down
  1. 1. longest side of the right triangle
  2. 2. a polygon with three sides
  3. 3. A triangle with no equal sides
  4. 4. an opposite of the base