Triangles


   
 
Summary
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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