Prove that the total measure of the three angle of a triangle is 180
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Explanation:
So, the angle sum ∠A + ∠B + ∠C is equal to the angle sum ∠A' + ∠B' + ∠C'. The three angles A', B', and C' form together a straight angle (they are along the line l). So, their angle sum is 180°.
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Explanation:
a + a + a = 180
3a = 180
a = 180/3
a = 60.
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