Geometry Crossword

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Across
  1. 4. An angle that is equal to 180 degrees
  2. 5. A triangle in which all three sides are in different lengths
  3. 6. Theorem that the sum of any two sides of a triangle is greater than or equal to the third side; (a + b ≥ c)
  4. 7. From"If it rains, then they cancel school" to "If they do not cancel school, then it does not rain." What conditional statement is this?
  5. 9. Trapezoid with right angles.
  6. 12. A flat surface of two dimensions
  7. 15. A general proposition proved by a chain of reasoning and truths
  8. 17. If m∠A=84º and m∠B=96º, then these two angles are what type of angles?
  9. 18. When two lines intersect each other, then the angles opposite to each other are called?
  10. 19. Has two pairs of opposite sides that are parallel and equal.
Down
  1. 1. d=√((x_2-x_1)²+(y_2-y_1)²)
  2. 2. Generally another word for the height of a triangle
  3. 3. The theorem that the sum of the exterior angles of a polygon is 360°
  4. 8. An opinion or conclusion formed on the basis of incomplete information
  5. 9. A part of the line having one fixed point and the other point does not have an end
  6. 10. ~p → ~q
  7. 11. What is the name for two angles with the sum of 90º?
  8. 13. A quadrilateral that has 2 pairs of equal-length sides and these sides are adjacent to each other
  9. 14. Points A, B, C lie on the same plane; what type of points are they?
  10. 16. The point where three bisectors of the interior angles of a triangle intersect