Computer Sciences > GATE 2024 SET-2 > Geometry
A cube is to be cut into 8 pieces of equal size and shape. Here, each cut should be straight and it should not stop till it reaches the other end of the cube.
The minimum number of such cuts required is
A
3
B
4
C
7
D
8

Correct : a

To find the minimum number of cuts required to divide a cube into 8 pieces of equal size and shape, let us analyze the dimensions of the cube:
• A cube is a three-dimensional object with three distinct axes: length, width, and height.
• To ensure that all resulting pieces have the exact same size and shape, our cuts must be symmetrical along these axes.
• If we make 1 straight cut passing completely through the middle along the length, the cube is divided into 2 equal parts.
• Making a 2nd straight cut through the middle along the width divides those parts further, resulting in 4 equal pieces.
• Making a 3rd straight cut through the middle along the height cuts all existing pieces in half, resulting in exactly 8 equal pieces (each piece being a smaller, identical cube).

Since each cut must go completely from one side to the other, making 1 cut along each of the 3 coordinate planes gives us exactly 2 × 2 × 2 = 8 identical pieces. Thus, the minimum number of cuts required is 3, matching option (a).

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