Triangle Summary

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  • In a triangle the line joining a vertex to the mid point of the opposite side is called a median. The three medians of a triangle are concurrent at a point called the "Centroid".
  • The perpendicular from a vertex to the opposite side is called the "altitude".
The three altitudes of a triangle are concurrent at a point called the "Orthocentre".
  • The bisectors of the three angles of a triangle meet at a point called the "Incentre".
  • The perpendicular bisectors of the three sides of a triangle are concurrent at a point called the "Circumcentre".
  • The sum of the angles of a triangle is equal to 180o.
  • If one side of a triangle is produced, the exterior angle so formed is equal to the sum of the interior opposite angles.

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