27/09/2013 Sum of Angles in a Triangle = 180 degrees

Below are some methods which we found in class!:) I'm eager to also show the 3rd method found outside of class!:P

Method 1: 

Fold the triangle to get a right angle 90 degrees. Triangles are half of a rectangle or square. Quadrilateral shapes have 4 right angles which add up to 360 degrees. So half of that is 180 degrees. 

Method 2: 

Tear out the angles and placed them along a line. You will find that they will fit into a line and the line represents half a circle which is 180 degrees.

Method 3:

The video below explains about how parrallel and vertical angles have corresponding angles on opposite sides.