what is the sum of triangle A, B, C
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The three angles A', B', and C' form together with a straight angle (they are along the line l). So, their angle sum is 180°. But then the angle sum ∠A + ∠B + ∠C must also be 180°. 3.
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the sum of a angles of a triangle ABC is always 180° because of angle sum property of triangle.
p.s.- please explain ur question correctly
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