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Because they are angles that are subtended by pairs of sides that are parallel to each other.
There are several ways of proving the angles are equal.
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Does a parallelogram have equal angles?
Yes, the opposite interior angles of a parellelogram are equal.
Are the opposite sides of a parellelogram parallel?
Yes. A parallelogram is defined as having opposite sides that are parallel and equal in length, and opposite angles that are equal.
Are opposite angles equal?
yes opposite angles are equal
What is a parellelogram with four congruent sides?
A parallelogram with equal sides is a rhombus. If the interior angles are right angles, it's a square.
Are opposite angles of a parallelogram not congruent?
A parallelogram has 2 equal opposite acute angles and 2 equal opposite obtuse angles.
Does a parallelogram have equal angles?
Yes, the opposite interior angles of a parellelogram are equal.
Are the opposite sides of a parellelogram parallel?
Yes. A parallelogram is defined as having opposite sides that are parallel and equal in length, and opposite angles that are equal.
Are all the angles in a parellelogram equal?
All the angles in a parallelogram can be equal, but are not always.
When is a square a parellelogram?
A square is always a parallelogram b/c a parallelogram is a quadrilateral with two pairs of parallel sides. The opposite or facing sides of a parallelogram are of equal length and the opposite angles of a parallelogram are of equal measure. A square is always this.
Are opposite angles equal?
yes opposite angles are equal
What is a parellelogram with four congruent sides?
A parallelogram with equal sides is a rhombus. If the interior angles are right angles, it's a square.
Are opposite angles of a rhombus congruent?
NOImproved Answer:-Yes a rhombus has equal opposite acute angles and equal opposite obtuse angles
Are opposite angles of a parallelogram not congruent?
A parallelogram has 2 equal opposite acute angles and 2 equal opposite obtuse angles.
Does an arrowhead have opposite angles equal?
It has one pair of opposite angles that are equal but not two.
Which quadrilaterals have opposite angles congruent?
A square and a rectangle have opposite equal 90 degree angles. A parallelogram and a rhombus have 2 opposite equal acute angles and 2 opposite equal obtuse angles.
Is a parellelogram a regular polygon?
No, If all angles are equal and all sides are equal, then it is a regular polygon (otherwise it is 'irregular'). In this case, parallelogram is irregular.
Are the opposite angles in a regular quadrilateral equal?
Yes, the opposite angles in a regular quadrilateral are equal.
