Class Notes NCERT Solutions for CBSE Students
B. In triangles ABC,
Side AB = 2 cm, BC = 3 cm, AC = 4 cm
AB + AC = 2 cm + 4 cm = 6 cm, AB + AC > BC
AB + BC = 5 cm, AB + BC > AC
AC + BC = 7 cm, AC + BC = AB
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.
CHECKPOINT
- The sum of all three angles of a triangle is 180°.
- 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
- a compass
- a ruler
- a protractor
- a well sharpened pencil
