Geometry Crossword

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Across
  1. 5. polygon with four edges (or sides) and four vertices or corners
  2. 10. a regular quadrilateral, it has four equal sides and four equal angles
  3. 12. having all its sides of the same length
  4. 14. the center of the incircle of a triangle or other figure.
  5. 16. having two sides of equal length
  6. 17. an angle of exactly 90°
  7. 18. identical in form; coinciding exactly when superimposed.
  8. 19. parallelogram with four equal sides and opposite equal angles
  9. 20. a triangle that has three unequal sides
Down
  1. 1. is the line segment connecting the midpoints of two sides of a triangle
  2. 2. 4-sided flat shape with straight sides where all interior angles are right angles (90°).
  3. 3. 4-sided flat shape with straight sides where opposite sides are parallel
  4. 4. The point where the three "altitudes" of a triangle meet.
  5. 6. the angle between any side of a shape, and a line extended from the next side.
  6. 7. the square of the length of the hypotenuse of a right triangle equals the sum of the squares of the lengths of the other two sides.
  7. 8. Any of the four angles formed inside two straight lines when these lines are intersected by a third straight line.
  8. 9. one which is more than 90° but less than 180°
  9. 11. a point of concurrency of the triangle
  10. 13. a plane figure with at least three straight sides and angles, and typically five or more.
  11. 15. refers to an angle less than 90°,