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In a parallelogram, opposite angles are equal. Since two angles measure 40 degrees each, the opposite angles are also 40 degrees. Therefore, the measures of the other two angles in the parallelogram are also 40 degrees each.
15
Not necessarily - the diagonals of a rhombus bisect each other (they are perpendicular bisectors of each other), but are not equal.
67.2
They are both equal to each other