Q:

# Are all parallelograms rectangles?

A:

Not all parallelograms are rectangles. A parallelogram is only a rectangle if it has four right angles and two pairs of parallel, congruent sides. Rectangles can also be called equiangular quadrilaterals, which means that they have four sides and equal angles. If three-dimensional, a rectangle is called a parallelepiped.

## Keep Learning

Credit: Mads Berg Ikon Images Getty Images

Types of parallelograms that are not rectangles include rhombuses and rhomboids. A square, technically a type of rectangle, is also a parallelogram. All parallelograms have two sets of parallel and congruent sides and four edges or vertices. Parallelograms are always simple quadrilaterals, or four-sided figures, that do not intersect themselves. Finally, they always have opposite angles that are equal in measure.

Sources:

## Related Questions

• A:

To find the area of a quadrilateral, find the height and width of the shape (for rectangles, squares, parallelograms and trapezoids), and then multiply the two numbers together. For rhombuses and kites, find the length of the diagonals, multiply the diagonals, and divide by two. Express the result in square units.

Filed Under:
• A:

Examples of parallelograms include rectangles, squares and rhombuses. Algebra.com defines a parallelogram as a quadrilateral, or polygon with four sides that are straight, with opposite sides that run parallel to each other.

Filed Under:
• A:

Even though both rectangles and rhombuses are quadrilaterals and parallelograms, they are different figures. Rectangles have four 90-degree angles and parallel opposite sides of equal length. Rhombuses have four equal-length sides, parallel opposite sides and equal opposing angles. Rhombuses are normally referred to as diamonds.