The video tutorial introduces 3D shapes, emphasizing their real-world relevance. It explains polyhedrons, prisms, cylinders, pyramids, and cones, detailing their properties and differences. The tutorial also covers calculating the surface area of these shapes, providing examples for rectangular prisms, square pyramids, cylinders, and spheres.

What is a polyhedron?

• A two-dimensional object with no edges

• A shape with only one circular base

• A three-dimensional object with flat surfaces called faces

• A two-dimensional shape with curved surfaces

Which of the following is NOT considered a polyhedron?

• Rectangular prism

• Square pyramid

• Cylinder

• Pentagonal prism

How is a prism named?

• By the shape of its bases

• By the number of edges

• By the number of vertices

• By the shape of its faces

What is the formula for calculating the surface area of a rectangular prism?

• 2(lw + lh + wh)

• lwh

• lw + lh + wh

• l + w + h

How do you calculate the surface area of a square pyramid?

• Area of the base plus the area of the sides

• Area of the base plus 4 times the area of a triangle

• Area of the base minus the area of the sides

• Area of the base times the height

What is the surface area formula for a cylinder?

• 2πr² + 2πrh

• πr² + 2πrh

• 2πr² + πrh

• πr² + πrh

What is the formula for the surface area of a sphere?

• 2πr²

• 3πr²

• 4πr²

• 5πr²