Angles and Triangles

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Across
  1. 2. a polygon with three sides; all three interior angles have a sum of 180 degrees; the length of any two sides of a triangle must be greater than the their side length
  2. 3. pairs of opposite angles formed by intersecting lines
  3. 5. two angles that have a sum of 90 degrees
  4. 6. two angles with a common side and a common vertex; they don’t overlap
Down
  1. 1. two angles that have a sum of 180 degrees
  2. 4. figures having the same size and same shape