Based on the worksheet you provided, here are the answers and explanations:

Question 19: Which object is a pyramid?

• The correct answer is B. This is because a pyramid has a square or triangular base and triangular sides that meet at a single point (the apex). The image of the Egyptian pyramid (B) represents this.

Question 20: Find the name of the 3D shape.

• Mina describes a 3D shape with:
  • 5 faces
  • 2 opposite triangular faces
  • Other faces are rectangles
• This shape is a Triangular Prism.

Would you like further clarifications or help with related concepts?

Here are some related questions for exploration:

1. What is the difference between a triangular prism and a pyramid?
2. How can you calculate the volume of a triangular prism?
3. What are some real-life examples of pyramids and triangular prisms?
4. How can you determine the surface area of a 3D shape like a triangular prism?
5. What are the defining characteristics of other common 3D shapes like cylinders and spheres?

Tip: To identify a 3D shape, count its faces, edges, and vertices while noting the shape of each face.