A prism is a 3-dimensional geometric figure that has two parallel and congruent bases, and its sides (lateral faces) are parallelograms.

The number of faces a prism has can be determined using the following rule:

- **A prism with an \(n\)-sided polygon as its base will have \(n+2\) faces.**

This is because:
1. There are two faces for the bases (one on the top and one on the bottom).
2. There are \(n\) lateral faces, one for each side of the polygon base.

For example:
- A triangular prism (base is a triangle) has 5 faces.
- A rectangular prism (base is a rectangle) has 6 faces.
- A pentagonal prism (base is a pentagon) has 7 faces.

Would you like more details or have any further questions?

Here are five related questions:
1. How many edges does a prism have?
2. How many vertices does a prism have?
3. What is the formula for the surface area of a prism?
4. What is the volume formula for a prism?
5. Can a prism have curved faces?

**Tip:** A right prism has its lateral faces perpendicular to the base, making calculations of volume and surface area easier.

Learn how to find the number of faces in a prism using the formula for prisms with n-sided polygon bases. This guide breaks down key geometry concepts, making it ideal for students in Grades 5-7. Explore examples with triangular, rectangular, and pentagonal prisms.

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