Geometry terms for parallel lines and congruent triangles

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Across
  1. 4. triangle a triangle with all three sides and angles of equal length.
  2. 7. interior angles The angles that are formed on opposite sides of the transversal and inside the two lines are alternate interior angles.
  3. 8. triangle a triangle with two equal sides and angles.
  4. 9. triangle a triangle where all three sides are of different lengths and angles, meaning none of the sides are equal.
  5. 10. angles the angles across from each other where two lines cross.
  6. 12. triangles if all three corresponding sides are equal and all the three corresponding angles are equal in measure.
  7. 14. Angle a point where two straight lines or rays meet.
  8. 15. Angle the angles formed at the "bottom" of the triangle and the base is considered as the bottom side.
  9. 18. Angle Sum Theorem states that when a triangle's side is extended, the exterior angle formed is equal to the sum of the measures of the two opposite interior angles of the triangle.
  10. 19. the longest side of a right triangle, which is always opposite of the right angle.
Down
  1. 1. angles two angles that when added together equal 180 degrees.
  2. 2. interior angles a pair of angles formed when a transversal line intersects two parallel lines, where the angles are located on the same side of the transversal and are both inside the parallel lines.
  3. 3. a line that passes through two lines in the same plane.
  4. 5. Property a geometric figure is the same size and shape as itself; essentially, a figure is always equal to itself.
  5. 6. exterior angles a pair of angles formed when a transversal intersects two parallel lines, where both angles lie outside the parallel lines and on the same side of the transversal.
  6. 11. exterior angles a pair of angles that lie on the outside of two lines cut by a transversal, but on opposite sides of the transversal.
  7. 12. angles angles that will be in the exact same place as the other line if you pick one line up and place it on top of the other.
  8. 13. Sum Theorem states that if you add all three interior angles, they will add up to 180 degrees.
  9. 16. angles two angles whose measures add up to 90 degrees.
  10. 17. pair two angles next to each other that together make a straight line.