1. Prove that the sum of three angles of a triangle is 180°
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angles of triangle = 180 degrees
so all the sides of the triangle will be xcm
=> x+x+x=180
=>3x=180
=>x=180/3
=>x=60 degrees
so now if we will add 60 three times then the sum will be 180 degrees
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see the attachment mate.
hope it helps
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