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2015-05-31T15:42:25+05:30

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Given measures of the opposite angles of a parallelogram are (3x-2) and (50-x)
We know that opposite angles of a parallelogram are equal 
⇒ 3x-2 = 50-x
⇒4x=52
⇒x=13 .
the angles are : (3×13)-2 = 39-2 = 37 degrees 
                        50-13     = 37 degrees .
                        
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You are wrong. Sum of opposite angles of a parallelogram is not 180º. Also, angles can't be negative.
2015-05-31T16:17:50+05:30
Opposite angles of a parallelogram are equal. Use this as a hint to solve the problem. Anyway, I'm also solving it for you.

3x-2=50-x
=> x=13º
Angles are --> 1) 37º
                        2) 143º
                        3) 37º
                        4) 143º
                        [Because Adjacent sides of a parallelogram are supplementary.]
1 5 1