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Some Basic Types and Results of Triangles
- The angle whose measurement is of
 is called RIGHT ANGLE.
- The angle whose measurement is greater than
 is called OBTUSE ANGLE.
- The angle whose measurement is less than
 is called ACUTE ANGLE.
- If
 ,  and  are the midpoints of the sides of  , then  ,  and  are called Medians of the triangles and medians of a triangles are concurrent at the point 
- If
 ,  and  are the perpendiculars from  ,  ,  to the sides  ,  and  of  respectively, then  ,  and  are called ALTITUDES OF THE TRIANGLE.
- The line passing through the mid points of the sides of
 , and perpendicular to the respective sides are called RIGHT BISECTORS OF THE TRIANGLE.
- Angle bisector of a triangle are concurrent at
 .
- The triangle whose one angle is
 is called a RIGHT ANGLED TRIANGLE.
- The triangle whose all the sides are of equal length, is called EQUILATERAL TRIANGLE.
- The triangle whose two sides or two angles are equal of measures, is called ISOSCELES TRIANGLE.
- If
 ,  and  are the internal angles of a triangle then  |
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