How will you prove that the sum of all three angles in a triangle is equal to 180
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Step-by-step explanation: By construction draw line DE through angle A parallel to BC.
Angle B= Angle DAB( Alternate Int. Angles)
Angle C=Angle EAC( Alternate Int. Angles)
Therefore, angle A+ angle B+ angle C= angle A+ angle DAB+ angle EAC
angle A+ angle DAB+ angle EAC= 180 degrees(Linear Pair)
Hence, proved.
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