- How many corner does a cube have in 4 dimensions? How many 3D faces?
Now by observation we can tell that, an n-dimensional cube has $2^n$ corners.
- 1D cube which is a line have $2^1$ corners
- 2D cube which is a square have $2^2$ corners
- 3D cube have $2^3$ corners
Hence, 4D cube have $16$ corners.
There are 16 corners and degree of every corner is 4, from this we can find out the number of 1-cubes,
Number of 1-cubes (line) in 4 dimensional cube = $\large \frac{16\times 4 }{2} = 32$
For calculating number of 2-cubes,
- Every line in a square (2-cube) participates in forming only 1 square (2-cube).
- Every line in a cube (3-cube) participates in forming only 2 squares (2-cube).
and Every line in a hypercube (4-cube) participates in forming 3 squares (2-cube).
Every line is participating in forming 3 squares (2-cube) and there are totally 32 lines.
Total number of 2-cubes or squares in a 4 dimensional cube = $\large \frac{32 \times 3}{4} $$=24$
Now the last question is Number of 3-cube in a 4-cube.
By observation we can see that every N-cube have $|2n|$ cubes of dimension (N-1).
- a line has 2 zero dimensional points.
- a square have 4 one-dimensional lines
- a cube have 6 two-dimensional planes
- a hypercube have 8 three-dimension cubes.
but this is the question iām not able to answer. How every N-cube have $|2n|$ cubes of dimension (N-1)?