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By Angle sum property of a triangle, the sum of all the three angles = 180 72 + 35 + x = 180 x = 180 - 107 x = 73 where x is ∡1
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By Angle sum property of a triangle, the sum of all the three angles = 180 72 + 35 + x = 180 x = 180 - 107 x = 73 where x is ∡1