The edges of a cube are 5 centimeters each and the diagonal of a face is approximately 7 centimeters. What is the approximate area of the cross section passing through the diagonals of opposite faces of this cube?

A. 12 square centimeters

B. 25 square centimeters

C. 35 square centimeters

D. 49 square centimeters

The area of the surface passing through the diagonal of a cube is a triangle, so we have to use the formula on the area of a triangle.

Getting the area of the triangle using the formula:

A = 1/2bh

band h = 5

A = 25/2 cm^2

since we also need the area of the opposite we will multiply it by 2

Total area = 25 cm^2. The answer is letter B. 25cm^2