triangles

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Across
  1. 1. the ___ of a triangle is half of that of a quadrilateral
  2. 3. a triangle with no sides equal
  3. 7. a right angled triangle will always obey _____ theorem
  4. 9. ___ is the study of the relationship between the sides and angles in a triangle.
  5. 10. two triangles with two equal angles and an equal side in between can be proved congruent by the ____ axiom
  6. 11. a triangle having two sides equal
  7. 13. a triangle with all angles equal
Down
  1. 2. the sum of two internal angles is always equal to the opposite ______
  2. 3. inverse of the cosine of an angle is ____
  3. 4. side opposite to the right angle in a right angled triangle
  4. 5. the side opposite to the largest angle is the ____ side
  5. 6. the point where the three medians of the three sides of a triangle intersect
  6. 8. an obtuse angled triangle will have one angle ___ than 90 degree
  7. 12. the perimeter of a triangle is the sum of its three ____