Question 1191341
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<pre>
First,  angle A plus angle D is 180 degrees,  or


    (2x-10) + (3x + 40) = 180

           5x           = 180 + 10 - 40 = 150

            x           = 150/5 = 30,

Hence,  angle A is 2x-10 = 2*30-10 = 50  degrees.


Angle B (which is CBA) is congruent to angle A;  so, angle CBA is 50 degrees.    <U>ANSWER</U>
</pre>

Solved.


The median XY is irrelevant to the problem.


The diagonals AC and BD are irrelevant, too.