Are opposite angles. There is nothing in the question that would require them to be equal or supplementary or anything.
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Vertically opposite angles. (vert. opp.)
They are equal opposite vertical angles and if the lines are perpendicular to each other then 90 degree angles are formed.
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.
Two angles that are congruent to each other and are on opposite sides of the parellel lines
Not for every parallelogram. Only for a rhombus (diamond) or square will the diagonals bisect the opposite angles they connect, and diagonals are perpendicular. In rectangles, the diagonals do not bisect the angles and are notperpendicular, but they do bisect each other.