Thursday , July 7 2022

NCERT 5th Class (CBSE) Mathematics: Polygons And Circles

B. In triangles ABC,

Side AB = 2 cm, BC = 3 cm, AC = 4 cm
Properties of Triangles(b) -1
AB + AC = 2 cm + 4 cm = 6 cm, AB + AC > BC
Properties of Triangles(b) -2
AB + BC = 5 cm, AB + BC > AC
Properties of Triangles(b) -3
AC + BC = 7 cm, AC + BC = AB
Properties of Triangles(b) -4

We can see that the sum of the lengths of any two sides of a triangle is more than the length of the third side. This is a property of all triangles.

Check this out for yourself.

Measure the sides of these triangles and compare the sum of the length of any two sides with the third side.

Properties of Triangles(b) -5


  1. The sum of all three angles of a triangle is 180°.
  2. The sum of the length of two sides of a triangle is always greater then the third side.

Construction of Triangles

It is possibles to draw a triangle even if you do not have all the information about it.

You will need

  1. a compass
  2. a ruler
  3. a protractor
  4. a well sharpened pencil

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