Math thing

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Across
  1. 2. a line that crosses at least two others
  2. 4. two angles that add to 90 degrees
  3. 6. an angle inside a shape, between two joined sides
  4. 7. lines on a plane that will never meet if they went on forever
Down
  1. 1. triangles with congruent angles bit with different side lengths
  2. 3. a three-straight-sided polygon
  3. 5. the angle between any side of a shape and a line that extends from the next side