The grey space is the area of the rectangle in the diagram below. The area of ABCD is the product of 6 and 8 which is equal to 48. Area 5 3 15.
The unit of measurement will be square inches as the lengths are multiplied together so are the units.
Formula of rectangle area in terms of sine of the acute angle between the diagonals and the diagonal of a rectangle. Check out this colorful and fun video and learn how to find the area of a Rectangle. To find the area of a rectangle multiply the length by the width. Area w h w width h height.