Basically the formula for area is equal to the product of length and breadth of the rectangle. This formula can be written as A L W or as A LW. The formula for the area of a triangle is height x p x radius 22 where radius 2 is the radius of the base d 2 x r so another way to write it is height x p x radius2.
Use this calculator if you know 2 values for the rectangle including 1 side length along with area perimeter or diagonals and you can calculate the other 3 rectangle variables.
If you have only the area and width you can use the same equation to solve for the area. If you have only the area and width you can use the same equation to solve for the area. We know w 5 and h 3 so. To calculate the surface area of a rectangular prism all you need to do is to calculate the areas of the rectangular sides.