Properties of Triangle

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Across
  1. 4. The __________ angle of a triangle is equal to the sum of the interior opposite angles.
  2. 6. A straight line that joins a vertex of a triangle with a point on the side opposite to it and is perpendicular to that side is called as ___________.
  3. 9. The _____ of the angles of a triangle adds up to 180˚.
  4. 11. The longest side in a right angled triangle is called the _____________.
  5. 12. The point where any two of the three sides of a triangle intersect is called the _____________ of the triangle.
Down
  1. 1. When two line segments intersect, they form an __________ at a point.
  2. 2. A straight line that joins a vertex of a triangle with the mid-point of the side opposite to it is called ___________ of the triangle.
  3. 3. A __________ is a closed figure made of three line segments.
  4. 5. The difference of any two sides of a triangle is ______ than its third side.
  5. 7. The sum of any _____ sides of a triangle is greater than its third side.
  6. 8. ____________ theorem applies only to right angled triangles.
  7. 10. The exterior angle of a triangle is __________ than either of the interior opposite angles.