theorem 1 (Exterior angle sum property) ...

theorem 1 (Exterior angle sum property) if the sides of quadrilateral are produced in order the sum of four exterior angles so formed is `360^@`.

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If the sides of a triangle are produced in order, then the sum of the three exterior angles so formed is (a) 90^0\ (b) 180^0 (c) 270^0 (d) 360^0

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