- Books Name
- class 7 Mathematics Book
- Publication
- ReginaTagebücher
- Course
- CBSE Class 7
- Subject
- Mathmatics
Special triangles
Two Special Triangles: Equilateral and Isosceles
A triangle in which all the three sides are of equal lengths and each angle has measure 60o is called an equilateral triangle.
In an equilateral triangle,
AB = BC = CA
And ÐA = ÐB = ÐC = 600
A triangle in which two sides are of equal lengths is called an isosceles triangle
In triangle XYZ,
XY = XZ
Sum of the Lengths of Two Sides of a Triangle
The sum of the lengths of any two sides of a triangle is greater than the length of the third side.
In the above figure,
AB + BC > AC
Also, the difference between the lengths of any two sides of a triangle is smaller than the length of the third side.