Geometry

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Across
  1. 3. a corner thingy
  2. 5. my name starts with a K
  3. 7. no sides equal
  4. 12. a 3 sided shape
  5. 13. A geometric figure which touches only the sides
  6. 14. a shape with no sides
  7. 15. a straight line that bisects an angle or a line segment
Down
  1. 1. middle of a line
  2. 2. at an angle of 90° to a given line
  3. 4. a straight line to angles
  4. 6. opposite of acute
  5. 8. opposite of obtuse
  6. 9. two sides equal
  7. 10. my last name starts with a Y
  8. 11. the enclosing boundary of a curved geometric figure, especially a circle.