- Books Name
- CBSE Class 7 Mathematics Book
- Publication
- Param Publication
- Course
- CBSE Class 7
- Subject
- Mathmatics
Perimeter of a Triangle
The sum of the lengths of the sides of a triangle is called its Perimeter.
In ∆ AC = b, BC = a, AB = c then perimeter is BC + CA + AB = a + b + c
TRIANGULAR INEQUALITY PROPERTY
The sum of the lengths of any two sides of a triangle is always greater than the third side.
AB + BC > AC
AB + AC > BC
AC + BC > AB
The difference between the length of any two sides of a triangle is smaller than the length of the third side.
AB – BC < CA
BC – CA < AB
CA – AB < BC
Example
XY + YZ > XZ
3 + 4 > 5
similary YZ + XZ > XY
4 + 5 > 3
similary XY + XZ > YZ
3 + 5 > 4