Geometry - part 1

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Across
  1. 3. Has exactly one pair of parallel sides
  2. 5. Sum of measures is 90
  3. 7. Have a common vertex
  4. 8. Formed by two intersecting lines
  5. 11. Sum of measures is 180
  6. 13. Has four right angles
  7. 15. Both pairs of opposite sides are parallel
  8. 17. Side-Side-Side
Down
  1. 1. Two intersecting lines that form a right angle
  2. 2. Side-Angle-Side
  3. 4. Has four right angles and four congruent sides
  4. 6. Has four sides
  5. 9. Number of square units inside a figure
  6. 10. Line that intersects two parallel lines
  7. 12. Has four congruent sides
  8. 14. Polygons that have same size and shape
  9. 16. Angle-Side-Angle