4) Prove that the sum of all angles in a triangle is 180
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In order to prove that the sum of angles of a triangle is 180, you must know the theorems of angles of a triangle. We know that, alternate interior angles are of equal magnitude. ... Now we have to substitute the angles. ∠PAB + ∠BAC + ∠CAQ = 180°.
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it is a postulate...
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you can prove it practically..
by arranging all cones in a point which will form a line.
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