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Only if it is an isosceles trapezoid otherwise no.

Q: Are all the base angles of a trapezoid congruent?

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a polygon that has all angles congruent is an equiangular .....

A trapezium with all its sides congruent is an impossible shape.

No, a trapezoid can't have all congruent sides because then it would be a square. A trapezoid by definition has one pair of parallel sides of different lengths.

False

The quadrilaterals with all angles congruent are rectangles and squares. They are the only quadrilaterals in which all four angles are right angles.

Related questions

No, not all angles in a trapezoid are congruent. A trapezoid may have two pairs of congruent angles, or may have no congruent angles.

By definition, all trapezoids must have one pair of parallel sides. Therefore, an isosceles has one pair of congruent angles.

I can't find a name for it but an example would be a trapezoid. Some might have congruent angles but not all do.

It will be either isosceles or equilateral. It is equilateral if all of the angles are congruent.

they are all complementary

No. All corresponding sides and angles have to be congruent for the triangles to be congruent.

Opposites sides of an isosceles trapezoid are congruent

Yes, the only four-sided regular polygon is a square, because all of its angles and sides are congruent. This does not apply to a trapezoid, so it is irregular.

I think a trapezoid.

All right angles are congruent, and all straight angles are congruent.

Only when it is an isosceles trapezoid otherwise no.

no