What is the surface area of a rectangular box that is 12 centimeters long, 10 centimeters wide, and 15 centimeters high?

SA= 2LW + 2LH + 2WH
Substituting for the values, SA = 900 cm^2

(Definition 4 The geometric mean is the positive square root of the product of two numbers. (Definition 5) Thegeometric mean of two numbers, a and b, is the length of one side of a square whose area is equal to the area of a rectangle with sides of lengths a and b.