prove that sum of all sides of triangle is 180'
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Answer:
Step-by-step explanation:
to prove: angle 1 + angle 2 + angle 3 = 180
proof:
angle 4 = angle 2( alternate interior angle); eq 1
angle 5 = angle 3(alt int); eq 2
add both equations
angle 4 +angel 5= angle 2 + angle 3
add angle 1 on both sides
angle 1 + angle 4 + angle 5 = angle 1 +angle 2 +angle 3
angle 1+ angle 2+ angle 3 = 180
hence proved
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