Surface Area of Cubes

In this video, Mr. J explains how to find the surface area of a cube. He begins by defining surface area as the total area of the outside part of a 3D figure. The video covers two methods for calculating the surface area: finding the area of one face and multiplying by six, and using the formula 6 times the side length squared. An example is provided with a cube of side length three feet, demonstrating both methods to arrive at the surface area of 54 square feet. The video concludes with a recap of the process and encourages viewers to practice the method.

What is the surface area of a 3D figure?

• The area of the base

• The volume of the figure

• The total area of the outside layer

• The length of all edges combined

How many faces does a cube have?

• Eight

• Four

• Five

• Six

If one face of a cube has an area of 9 square feet, what is the total surface area of the cube?

• 36 square feet

• 45 square feet

• 54 square feet

• 63 square feet

What is a net in relation to a 3D figure?

• A method for finding perimeter

• A formula for calculating area

• A 2D representation of a 3D figure

• A tool for measuring volume

How do you calculate the area of one face of a cube with side length 3 feet?

• 3 x 9

• 3 x 3

• 3 + 3

• 3 x 6

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

• side length squared

• side length cubed

• 6 x side length

• 6 x side length squared

In the formula for surface area, what does 'squared' refer to?

• Subtracting the side length from itself

• Dividing the side length by two

• Adding the side length to itself

• Multiplying the side length by itself

What is the result of 3 squared?

• 15

• 6

• 9

• 12

Why do we multiply the area of one face by six to find the surface area of a cube?

• Because a cube has six faces

• Because each face is different

• To account for the volume

• To simplify the calculation

What is the surface area of a cube with side length 3 feet using the formula?

• 36 square feet

• 45 square feet

• 54 square feet

• 63 square feet