CBSE Class 9 Maths Chapter 7 Triangles Revision Notes

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CBSE Class 9 Maths Chapter 7 Triangles Revision Notes

 

Revision is very important for better conceptual understanding and securing good marks, and for Revision, Revision Notes are always considered the best. Revision Notes can be very beneficial for students to revise all their previously prepared chapters and concepts, especially during the examination times when they have to revise the whole syllabus in a limited time period.

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Properties of Triangles

 

Angles opposite to equal side of a triangle:

  • If in a triangle, 2 sides are equal then the angles opposite the sides are also equal.
  • Base angles of an isosceles triangle are equal

 

Sides opposite to equal angles of a triangle:

If in a triangle, 2 angles are equal then the sides opposite the angles are also equal.

 

Inequalities in a triangle:

Triangle elements like sides, angles, areas, etc. are bound by inequalities, foremost of which is the Triangle Inequality.

The triangle inequality theorem is very useful when one needs to determine if any 3 given sides will form a triangle or not. Angle opposite to the longer size is larger.

If ∠B > ∠A > ∠C then b > a > c. Side opposite to the larger angle is longer. If b > a > c then ∠B > ∠A > ∠C.

The Sum of any two sides of a triangle is greater than the third side:
a + b > c
b + c > a
a + c > b

 

CBSE Class 9 Maths Chapter 7 Triangles Revision Notes PDF

 

Triangles