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| 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". |
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The perpendicular from a vertex to the opposite side is called the "altitude". |
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| The three altitudes of a triangle are concurrent at a point called the "Orthocentre". |
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The bisectors of the three angles of a triangle meet at a point called the "Incentre". |
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The perpendicular bisectors of the three sides of a triangle are concurrent at a point called the "Circumcentre". |
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The sum of the angles of a triangle is equal to 180o. |
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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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