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**Sum of angles of a triangle**

**Sum of any two sides of a triangle is greater than the third side.**

**Pythagoras theorem**

**Line joining the mid-point of a side of a triangle to opposite vertex is Median**

**Point where three medians of a triangle meet.**

**Centroid divides each median in ratio 2:1.**

**The altitude from the vertex bisect the base in an isosceles triangle**

**Median divides a triangle into two triangles of the same area**

**The line joining the midpoints of any two sides of a triangle is parallel to 3rd side and equal to half of it**

**The four triangles formed by joining the midpoints of the sides of a given triangle are equal in area: each equal to one-fourth of given triangle.**