In order to calculate its surface area or volume you must know the radius of the base and the length of the side. Since a rectangular box or tank has opposite sides which are equal we calculate each unique sides area then add them up together and finally multiply by two to find the total surface area. To start out lets find the surface area of just one face.
A rectangle is a special type of quadrangle where all the interior angles are equal to 90 and all opposite sides are the same length.
For example a garden shaped as a rectangle with a length of 10 yards and width of 3 yards has an area of 10 x 3 30 square yards. If using this calculator to compute the surface area of a hollow sphere subtract the surface area of the base. A lateral a h b h c h h a b c when simplified is A lateral h P. Surface_area 2 base_area lateral_area which in our notation translates to A 2 A_b A_l.