Question

Richard is asked to spray wash the exterior of a building that is shaped like a cube. The building has a side length of 7 meters. How much surface area will Richard have to clean?

7 meters squared.
245 meters squared.
49 meters squared.
294 meters squared.

Answer 1

245 meters squared (correct on my test)

Explanation:

Remember, in this case, we complete the formula and then subtract the area of the base. Therefore, we take 6 x (7 meters)^2 and subtract (7 meters)^2. This can also be represented as 5 x (7 meters)^2.

Answer 2

294 meters squared

Explanation:

Surface area of cube is calculated using the formula :

Surface area of cube = 6a²; where a = side length of the cube

The side length of the cube, a = 7 meters

Hence,

Surface area = 6 * 7² = 6 * 49

Surfave area of cube = 294 meters