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 prove that the sum of all angles of a triangle is 180 degree by paper cutting and pasting

Task: Prove that the sum of all angles of a triangle is 180 degree by paper cutting and pasting?

Step 1:

Draw atriangleABCand cut out the threeangles.

Step 2:

Rearrange the three angles to form astraight angleon a straight line.

So, the angle sum of a triangle is 180.

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draw a triangle on a sheet of paper and cut it out. now there are two ways of doing it:-

1) fold the base angles of the triangle such that they meet at a point on the base of the triangle. now fold the remaining angle such that it also meets the other two at the same point. you will see that these three angles form a line, hence there sum is 180o.

2) the second way is to simply cut the three angles and you'll see that you can easilt arrange them to form a line.

hope dis helps! <3

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thx dude

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