A diagonal of a parallelogram divides it into two congruent triangles, so the area of a parallelogram is twice the area of either of those triangles. Using the area formula for a triangle, the area of the parallelogram shown above is: A parallelogram is a two-dimensional shape. It has four sides, in which two pairs of opposite sides are parallel. The parallelogram formula is used to calculate the area and perimeter of a parallelogram . Understand the parallelogram formula with derivation, examples, and FAQs. The area of a parallelogram is determined by multiplying the length of the base by the corresponding height. Explore the formula, calculation, facts, & examples. The area of a parallelogram is the base multiplied by the. perpendicularPerpendicular lines are at 90° (right angles) to each other. height. The base of a parallelogram is one of the sides....