Class 9 Exam  >  Class 9 Notes  >  Mathematics (Maths) Class 9  >  Important Formulas: Triangles

Important Formulas: Triangles | Mathematics (Maths) Class 9 PDF Download

Important Formulas

Important Formulas: Triangles | Mathematics (Maths) Class 9Important Formulas: Triangles | Mathematics (Maths) Class 9Important Formulas: Triangles | Mathematics (Maths) Class 9

Different Criterion for Congruence of the triangles

Important Formulas: Triangles | Mathematics (Maths) Class 9Important Formulas: Triangles | Mathematics (Maths) Class 9Important Formulas: Triangles | Mathematics (Maths) Class 9

Some Important Points on Triangles

  • Orthocenter: Point of intersection of the three altitude of the triangle
  • Equilateral: Triangle whose all sides are equal and all angles are equal to 60º
  • Median: A line Segment joining the corner of the triangle to the midpoint of the opposite side of the triangle
  • Altitude: A line Segment from the corner of the triangle and perpendicular to the opposite side of the triangle
  • Isosceles: A triangle whose two sides are equal
  • Centroid: Point of intersection of the three median of the triangle is called the centroid of the triangle
  • In center: All the angle bisector of the triangle passes through same point
  • Circumcenter: The perpendicular bisector of the sides of the triangles passes through same point
  • Scalene triangle: Triangle having no equal angles and noequal sides
  • Right Triangle: Right triangle has one angle equal to 90º
  •  Obtuse Triangle: One angle is obtuse angle while other two are acute angles
  • Acute Triangle: All the angles are acute 
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