Question 16
Lisa has a big cube combined by 27 small cubes with side length 1 cm as the figure below. Then, she takes out one small cube at the center and one small cube at the middle of each face. Find the total surface area of the new figure.
Source-language discrepancy: the Vietnamese text says “one face”, whereas English says “each face”. Grading follows the English and the depicted face openings: remove the central cube and all six face-center cubes. The original figure is unchanged.
Source-language discrepancy: the Vietnamese text says “one face”, whereas English says “each face”. Grading follows the English and the depicted face openings: remove the central cube and all six face-center cubes. The original figure is unchanged.