What is a Parallelogram?

A parallelogram is a special type of quadrilateral where both pairs of opposite sides are parallel and equal in length. Unlike a rectangle, its internal angles do not have to be 90 degrees. Common shapes that fall under the category of parallelograms include squares, rectangles, and rhombuses.

How to Use This Parallelogram Calculator

Our online tool is designed to be flexible. You can calculate the area and perimeter using different sets of known values:

• Base and Height: If you know the base (b) and the vertical height (h), the area is simply b × h.
• Sides and Angle: If you know two adjacent sides (a and b) and the angle (θ) between them, you can find the height using the formula h = a × sin(θ).

Essential Formulas

To calculate the dimensions manually, use the following geometry formulas:

Area (A): Area = Base × Height or Area = Side A × Side B × sin(θ)

Perimeter (P): Perimeter = 2 × (Side A + Side B)

Frequently Asked Questions

Is a rectangle a parallelogram? Yes, every rectangle is a parallelogram because its opposite sides are parallel. However, not every parallelogram is a rectangle.

Can I find the area without the height? Yes, if you have the lengths of two adjacent sides and the angle between them, you can use the trigonometric formula mentioned above.