This document discusses several key properties of triangles. It states that the sum of the interior angles in any triangle is always 180 degrees, known as the angle sum property. It also notes that an exterior angle is equal to the sum of the opposite interior angles. Additionally, the document explains that in a right triangle, the square of the hypotenuse is equal to the sum of the squares of the other two sides, known as the Pythagorean theorem.

1. By Azam Khan
7-B

2. The sum of the angles in a triangle is
always equal to 180.This property is
called the angle sum property of a
triangle.

4. Exterior angle is equal to the
sum of the opposite interior
angles.

6. The sum of any two sides
is always bigger than the
third side.

7. 21
47+21=68>42
21+42=63>47
47+42=89>21

8. In a right angled triangle, the
square of the longest side is
equal to the sum of the squares
of the other two sides.