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Questions  >>  Olympiad-Math  >>  Class 9  >>  Lines and Angles
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Q)

Which of these are true


( A ) Sum of all the interior angles of the polygon is (n-2)180
( B ) Two angles x and y are adjacent, The sum x+y will always be 180
( C ) None of these
( D ) The exterior angle in a triangle is equal to 180 - ( sum of two opposite interior angles)

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