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Adjacent angles of a parallelogram are equal because of the properties of parallel lines and transversals. In a parallelogram, opposite sides are parallel, and when a transversal intersects these parallel lines, it creates equal alternate interior angles. Therefore, each pair of adjacent angles, which are supplementary (sum to 180 degrees), must be equal to maintain this relationship. This results in each adjacent angle being half of the total degree measure of 180 degrees.

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1w ago

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Related Questions

Are opposite angles in a parallelogram supplementary?

No, they are equal. Adjacent angles are supplementary in a prallelogram.


Are adjacent angles in a parallelogram are supplementary?

Adjacent angles in a parallelogram are supplementary.


Do opposite angles in a parallelogram add up to 180?

No. Opposite angles are equal. Adjacent angles are supplementary.


Is a rhombus a a parallelogram with all equal angles?

No. A rhombus is a parallelogram with all equal sides. A parallelogram with all equal angles is a rectangle (which might also be a rhombus and a square).


Does all angle of a rhombus equal?

A rhombus is a special case of a parallelogram, where all sides are equal length. A rhombus and a parallelogram have the opposite vertices are equal angles, but adjacent angles are not necessarily equal.


What is parallelogram with 4 right angles and two adjacent sides equal?

A square.


What is a figure that has 1 pair of equal angles and has 2 pairs of equal adjacent sides?

a parallelogram


Are all angles of a parallelogram equal to 90 degrees?

No, only in a square (regular parallelogram).The opposite angles are EQUAL in a parallelogram, and the adjacent angles are SUPPLEMENTARY(they equal 180 degrees).So if any angle in a parallelogram is a right angle, they all are. Otherwise, there are no right angles.The angles of a parallelogram will average 90 degrees, as there are 360 degrees in any quadrilateral, (360/4 - 90) and 180 degrees in two adjacent non-equal angles (180/2 = 90).


Can a square or rectangle be a parallelogram?

A Square and a Rectangle are both Parallelogram.Square:A square is a parallelogram in which adjacent sides are equal and one of its angles is 90o.Rectangle:A Rectangle is a parallelogram in which one of its angles is 90o.


You are a plane figure with four sides all sides are of equal but adjacent angles are not equal What are you?

equilateral parallelogram


Does a parallelogram intersect at right angles?

A parallelogram does not necessarily intersect at right angles. In a parallelogram, opposite angles are equal, and adjacent angles are supplementary, which means they can vary in measure. However, if the parallelogram is specifically a rectangle or a square, then it does intersect at right angles. Otherwise, a general parallelogram typically does not have right angles.


Why does a parallelogram equal to 180?

A parallelogram does not equal 180. A parallelogram is a plane figure bounded by two pairs of parallel lines. What does equal 180 is the sum of the measures of any pair of adjacent angles. The two adjacent angles have a side in common. If that line is considered as the intercept of the pair of parallel lines, it is easy to show that the angles should add to 180 degrees.