Geometry

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Across
  1. 4. equal
  2. 5. Lonely
  3. 6. Can be 180 degrees but not hot
  4. 7. Matching
  5. 9. The angle sandwich
  6. 11. Poor side is excluded
  7. 13. A shape with three sides
  8. 14. ΔBCA≅ΔBTA
  9. 15. Kind of SASsy
  10. 16. No angles needed
Down
  1. 1. Not lonely
  2. 2. Hypotenuse² = Base² + Perpendicular²
  3. 3. a²+b²=?
  4. 8. 90 degrees
  5. 10. Need them to walk
  6. 12. The walls of shapes