2.1 Area and Perimeter

Perimeter is defined as:

• the measurement of the space inside a shape

• the total distance around the outside of a shape

• the outside length of opposite sides of a shape

• the base length multiplied by the height

In math, area is defined as:

• the total distance around a shape

• a place in a room

• the space outside a shape

• the amount of space inside a shape ( measured in units ² )

What is the formula for finding the perimeter?

Tags

CCSS.4.MD.A.3

What is the formula for finding the area of a shape?

Tags

CCSS.4.MD.A.3

CCSS.3.MD.C.7B

Perimeter is used in the real world to figure what?

• Length of a closed fence

• Measurement of a single wall floor to ceiling

• Surface area of new carpet

• Amount of concrete needing poured

Area is used in the real world to figure what?

• Length of guttering around a new house

• Amount of water needed for a pool

• The amount of paint needed to paint a wall

• The distance of a wall in a bedroom

What is the perimeter of this shape?

• 45 in

• 28 in

• 28 in²

• 18 in

Tags

CCSS.4.MD.A.3

What is the area of this shape?

• 40 ft

• 99 inches

• 99 ft²

• 20 ft²

Tags

CCSS.4.MD.A.3

CCSS.3.MD.C.7B

What is the occupied area of this wood plank?

• 80 in²

• 24 in²

• 48 in²

• 48 in

Tags

CCSS.4.MD.A.3

CCSS.3.MD.C.7B

Think about it. If I had a room with a floor space measuring 60 inches by 80 inches (total area of 4,800 inches), how many of these wood floor planks would I need exactly for the room?

Hint: What is the area of this single wood plank? What is the area of the floor space? Divide the two values.

• 3 floor planks

• 80 floor planks

• 60 floor planks

• 35 floor planks