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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).

Q: Are all angles of a parallelogram equal to 90 degrees?

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It is a square, a regular parallelogram with all right angles. The reason is that in a parallelogram, the adjacent angles are supplementary (equal 180 degrees).In any case, the opposite angle would be 90 degrees as well, leaving just 180 degrees for the other two identical opposite angles.

A square.

Not necessarily. A parallelogram is a quadrilateral with 2 sets of 2 parallel sides. Only rectangles and squares have right angles as all four angles - a rectangle is a "special" parallelogram that has all four angles equal; a square is a "special" rectangle that has all four sides of equal length.

No, not necessarily. A parallelogram can have all sides equal, but still not be a square.

A parallelogram has two sets of parallel sides. It can have four sides that are equal in length. That is why a square is also a parallelogram. You can have a parallelogram with two sets of parallel sides, all of which are equal in length, but they do not meet in right angles. It looks kind of like a lopsided or squished square, and it is called a rhombus.

Related questions

360 degrees

If you add the values of all four angles in a parallelogram together, the total will be 360 degrees.

A RHOMBUS has four equal sides. However, it opposite angles are equal ,but its adjacent angles are NOT equal , but sum to 180 degrees.

The interior angles of all quadrilaterals sum to 360 degrees. Since a parallelogram is a quadrilateral, its interior angles must sum to 360 degrees.

A parallelogram has 2 equal opposite acute angles and 2 equal opposite obtuse angles whereas all 4 angles add up to 360 degrees.

Not unless all angles are also equal. A rhombus is a parallelogram with all sides equal. A rectangle is a parallelogram with all angles equal. A square is a rhombus with all angles equal which is a parallelogram with all sides equal and all angles equal.

No. A parallelogram has opposite sides parallel.A square is a parallelogram with all sides being equal and all internal angles being 90 degrees.A rectangle is a parallelogram with all internal angles being 90 degrees. and opposite side being equal in length.A rhombus is a parallelogram with all sides equal, but internal angles are not necessarily 90 degrees.

A rectangle cannot be a parallelogram because a parallelogram has opposite sides that are parallel and equal in length, while a rectangle has all angles equal to 90 degrees. Thus, a rectangle is a specific type of parallelogram that has the additional property of having all angles equal to 90 degrees.

A parallelogram has 2 opposite equal acute angles and 2 opposite equal obtuse angles that add up to 360 degrees and so the angles are 60, 60 120 and 120 degrees.

All 4 sided shapes each equal to 360 degrees in angles

They can, but usually they are not. All the angles will be equal only if your parallelogram is a rectangle.

A parallelogram is a square when all 4 angles of the parallelogram are equal to 90 degrees and all 4 sides are congruent to each other