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We are tasked with finding the dihedral angle, which is the angle between two planes of a regular tetrahedron with side length 12 cm.

### Step-by-Step Solution:

1. **Properties of a Regular Tetrahedron**:
   - A regular tetrahedron has 4 equilateral triangular faces.
   - All the edge lengths are equal, and the dihedral angle between any two planes (faces) is the same.

2. **Dihedral Angle Formula**:
   For a regular tetrahedron, the dihedral angle \(\theta\) between two faces can be calculated using the following standard formula:
   \[
   \cos(\theta) = \frac{1}{3}
   \]
   From this, we can find the dihedral angle:
   \[
   \theta = \cos^{-1} \left(\frac{1}{3}\right)
   \]

3. **Calculating the Angle**:
   Using a calculator:
   \[
   \theta \approx \cos^{-1}(0.3333) \approx 70.53^\circ
   \]

Thus, the dihedral angle between any two planes of the tetrahedron is approximately **70.53°**.

### Summary:
The angle between any two planes of the tetrahedron is about **70.53 degrees**.

Would you like further details on how to derive the dihedral angle formula for a tetrahedron, or do you have other questions?

Here are some related questions:
1. What are the properties of a regular tetrahedron?
2. How is the dihedral angle related to the geometry of 3D shapes?
3. Can the dihedral angle vary for irregular polyhedra?
4. How would we calculate the surface area of a tetrahedron?
5. What is the volume of a regular tetrahedron with side length 12 cm?

**Tip**: For complex 3D shapes, visualizing the geometry can help in understanding the relationships between different angles and planes.

A packet of milk is in the shape of a regular tetrahedron of side 12 cm. Calculate the angle between any two planes of the tetrahedron.

Learn how to calculate the dihedral angle between two planes of a regular tetrahedron with side length 12 cm. This problem covers key geometry concepts, including the use of the cosine formula for dihedral angles. Suitable for students in Grades 10-12.

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