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Square

Or a rectangle, which also has 4 sides and 4 90 degree angles.

Q: Quadrilateral having all sides 90 degrees what is it called?

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Angles are measured in degrees, not sides.

Any quadrilateral with two sets of parallel sides is called a parallelogram.

When all the vertices of a plane quadrilateral are exactly equal to 90 degrees it is is called a rectangle and, if all its sides are of equal length, that rectangle is called a square. So when a plane quadrilateral has all its vertices exactly equal to 90 degrees, but it does not have all its sides equal in length, it must be a rectangle but not a square.

A trapezoid is a 4 sided quadrilateral having a pair of parallel sides and 4 various interior angles that add up to 360 degrees

Because it is a regular 4 sided quadrilateral having 4 equal sides and 4 equal interior angles each measuring 90 degrees.

Related questions

A quadrilateral having only one pair of parallel sides is called a trapezoid (UK trapezium).A quadrilateral having two pair of parallel sides is a parallelogram (a square, a rectangle, a rhombus, or a two-dimensional rhomboid).

Angles are measured in degrees, not sides.

Any quadrilateral with two sets of parallel sides is called a parallelogram.

You classify a quadrilateral by its sides, angles, and its vertices. All quadrilaterals are 4-sided polygons having 4 interior angles that add up to 360 degrees.

quadrilateral

That is the correct spelling of quadrilateral (having four sides).

When all the vertices of a plane quadrilateral are exactly equal to 90 degrees it is is called a rectangle and, if all its sides are of equal length, that rectangle is called a square. So when a plane quadrilateral has all its vertices exactly equal to 90 degrees, but it does not have all its sides equal in length, it must be a rectangle but not a square.

Quadri means four. Lateral means sides. A quadrilateral has four sides.

a quadrilateral

360 degrees

quadrilateral

A trapezoid is a 4 sided quadrilateral having a pair of parallel sides and 4 various interior angles that add up to 360 degrees