Answer:
10 centimeters by 18 centimeters
Explanation:
we know that
The rectangular cross section is parallel to the front face
That means-----> The dimensions of the cross section are congruent with the dimensions of the front face
The dimensions of the front face are 10 centimeters by 18 centimeters
therefore
The dimensions of the cross section are 10 centimeters by 18 centimeters