Area of a parallelogram . Definition and formulawhere b is the length of any base a is the corresponding altitude See Derivation of the formula . Recall that any of the four sides can be chosen as the base. You must use the altitude that goes with the base you choose. The altitude (or height) of a parallelogram is the perpendicular distance from the base to the opposite side (which may have to be extended). In the figure above, the altitude corresponding to the base CD is shown. Area of a Parallelogram Formula The area of a parallelogram is the measure of the space enclosed within its four sides. In a parallelogram , opposite sides are equal and parallel, and opposite angles are equal. There are several ways to calculate the area depending on the given information, such as base and height or two adjacent sides and the angle between them. Below are two formulas for calculating the area of a parallelogram , with detailed explanations and examples for each. Formulas for ... Learn how to calculate the area of a parallelogram using different methods and formulas. Find examples, activities, and vector form of the area of a parallelogram . When it comes to the formula in finding the area of a parallelogram , we basically multiply the length of its base b b by its corresponding height h h, that is, A r e a = b × h Area = b × h.