Surface Area of Rectangular Prisms

Mr. Buffington from Simplify Academy explains the concept of surface area using rectangular prisms. The video covers the definition of surface area, the parts of a rectangular prism, and how to calculate surface area by adding the areas of individual rectangles. It introduces a formula to simplify the calculation process and demonstrates its application through examples and practice problems. The video also includes word problems to reinforce understanding and offers two different formula representations for flexibility in solving surface area problems.

What is the surface area of a 3D object related to?

• The number of edges it has

• The weight of the object

• The amount of paint needed to cover it

• The volume of the object

How many rectangles make up the surface area of a rectangular prism?

• Four

• Eight

• Six

• Five

What is the first step in manually calculating the surface area of a rectangular prism?

• Multiply the width by the height

• Find the volume of the prism

• Add up the lengths of all edges

• Calculate the area of each rectangle

Which of the following is part of the surface area formula for a rectangular prism?

• 4 times the height times the length

• 3 times the length times the width

• 5 times the width times the length

• 2 times the width times the height

What should you do after substituting values into the surface area formula?

• Subtract the smallest number

• Divide the numbers by two

• Multiply the numbers first

• Add all the numbers together

In the practice problem, what is the width of the rectangular prism?

• Nine

• Six

• Eight

• Four

What is the alternative way to write the surface area formula?

• By adding more twos

• By using parentheses to factor out common terms

• By subtracting the height from the length

• By dividing the formula by two

What is the surface area of a box that is 12 cm wide, 15 cm long, and 30 cm tall?

• 1980 square centimeters

• 1500 square centimeters

• 1800 square centimeters

• 2100 square centimeters

Which formula might be easier to use due to fewer twos involved?

• The formula with subtracted width

• The original formula

• The simplified formula with parentheses

• The formula with added height

How much wrapping paper is needed for a gift that is 4 inches long, 2 inches wide, and 5 inches tall?

• 90 square inches

• 70 square inches

• 80 square inches

• 76 square inches