SUPER DUPER SIGMA IMRIE PUZZLE

Edit Answers
123456789101112131415161718
Across
  1. 3. (x+y)\2
  2. 4. same size, shape, length, angles
  3. 9. the lines equal to 180° 45°+45°+45°+45°
  4. 13. All of the sides of the shape are the same
  5. 14. only two sides are equal in shape normally; triangles are used
  6. 15. Sides cross to make a right angle
  7. 17. all sides and angles equal, four sides
  8. 18. everything is the same
Down
  1. 1. straight line connecting the corners example: square
  2. 2. it's in its name
  3. 5. one parallel pair of parallel sides
  4. 6. a congruent with congruent sides but not angles
  5. 7. Opposite sides are equal, opposite sides are congruent, consecutive angles are supplementary
  6. 8. sides are equal and parallel
  7. 10. equal parts
  8. 11. One diagonal is the bisector of the other
  9. 12. A shape with more than 2 sides
  10. 16. every angle is the same in the shape