How do we decide if a situation requires us to

measure in square units or cubic units?

1 cm.

1 cm.1 cm.

1 cm.1 cm.

In this lesson you will learn to determine whether to find area,

surface area, or volume in a given situation by thinking about

what units are needed.

Let’s ReviewCore Lesson

AREA is the amount of square units that fit inside a 2D figure.

Let’s ReviewLet’s Review

SURFACE AREA is the sum of the areas of the faces on a 3D solid.

Let’s ReviewLet’s Review

VOLUME is the number of cubic units needed to fill the space inside a 3D figure.

Let’s ReviewCore Lesson

How many square inches

is this pentagon?

Here are some situations that require you to find area.

How big is one sheet of loose

leaf paper?

Which is larger - California or

Michigan?

I find area when I need to measure a 2D object using

square units.

Let’s ReviewCore Lesson

How much cardboard was used to make

this box?

Here are some situations that require you to find surface area.

How many square feet of fabric were needed to create

this tent?

Which gift requires more

wrapping paper?

I find surface area when I need to measure the

outside of a 3D object using square units.

Let’s ReviewCore Lesson

How much soda will fit

into this two-liter bottle?

How much orange juice

will this carton hold?

How many cups of cereal will fit into this

box?

Which container will

hold more popcorn?

Here are some situations that require you to find volume.

I find volume when I must measure the inside of a 3D object using cubic units.

In this lesson you have learned to determine whether to find

area, surface area, or volume in a given situation by thinking about what units are needed.

Let’s ReviewGuided PracticeDebbie is renovating her house. Decide if each situation requires her to measure area, surface area, or volume.

She wants to paint all of the bedroom walls. How much paint is needed?

SURFACE AREA

She needs to buy a new door at the hardware store. What size door should she purchase?

AREAVOLUME

She needs to know how much water will be needed to fill up her new swimming pool.

Let’s ReviewExtension Activities

Think of a situation where you would need to find the area, surface area, and volume of this swimming pool.

Let’s ReviewExtension Activities

In this lesson, you learned various situations where you would need to find area, surface area, and volume. Spend the next five minutes brainstorming as many situations as you can of additional situations where you would need to find area, surface area, and volume. Be creative.

Let’s ReviewQuick QuizCelia wants to know if the 25 square inches of wrapping paper she has will be enough to cover her mom’s birthday gift. Does she need to find area, surface area, or volume?

Darius wants to know which bottle will hold more lemonade. Does he need to find area, surface area, or volume?