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Q: Why is a rectangle a special angle?

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In general, trapezoids do not have right angles. In fact, a trapezoid with a right angle is a special case, called a rectangle.

Each angle of a rectangle is a right angle. (90°)

Except for the special case of a rectangle, a parallelogram must have two acute angles.

A rectangle is a quadrilateral with 4 sides and 4 right angles. A square is a special form of rectangle, and it meets that criterion. But it is also equilateral, meaning its sides are all the same length (are all equal). It is a rectangle or a square. A square is a special type of rectangle with all sides having equal length. Here is a a nice chart showing the quadralaterals. http://content.answers.com/main/content/wp/en/f/f1/Quadrilateral_hierarchy.pngA quadrilateral where each angle is a right angle is known as an oblong.

A rectangle is defined as "a parallelogram with one right angle" A parallelogram is defined as "a quadrilateral with opposite sides equal and parallel" This makes a rectangle a sort of second-generation quadrilateral!

Related questions

A parallelogram with a right angle is a rectangle.

Yes, a rectangle is a special kind of parallelogram - one that has a right angle. (You can prove that if it has one right angle all angles are right.)

A rectangle is not an angle.

In general, trapezoids do not have right angles. In fact, a trapezoid with a right angle is a special case, called a rectangle.

Each angle of a rectangle is a right angle. (90°)

A destroyed angle is called to as a rect-angle. It's a pun on the "wreck"tangle

Yes (or its special case, a square).

Except for the special case of a rectangle, a parallelogram must have two acute angles.

Yes, a rectangle can have one obtuse angle.

A rectangle is a quadrilateral with 4 sides and 4 right angles. A square is a special form of rectangle, and it meets that criterion. But it is also equilateral, meaning its sides are all the same length (are all equal). It is a rectangle or a square. A square is a special type of rectangle with all sides having equal length. Here is a a nice chart showing the quadralaterals. http://content.answers.com/main/content/wp/en/f/f1/Quadrilateral_hierarchy.pngA quadrilateral where each angle is a right angle is known as an oblong.

A rectangle is defined as "a parallelogram with one right angle" A parallelogram is defined as "a quadrilateral with opposite sides equal and parallel" This makes a rectangle a sort of second-generation quadrilateral!

A square is a special rectangle.