Understanding Area and

Perimeter

Perimeter

The distance around the outside of an object.

P E R

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M

T E

R

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Perimeterof a Rectangle

10 feet

10 feet

4 ft

How do I measure the perimeter?

Find the total distance around the outside:

Length + Length + Width + Width

10 + 10 + 4 + 4 = 18 feet

4 ft

Perimeter

Examples in the Real World: Fence around a yard

Perimeter

Examples in the Real World: Edges of a picture frame or a table

Area

The space inside of an object. We measure area using square units.

A R E A

Area of a Rectangle

4 feet

3 feet

How do I measure the Area?

Length = 4 feet (4 squares)

Width = 3 feet (3 squares)

This is a 4 by 3 rectangle – like the array.

I can count a total of 12 square feet

Or

Multiply Length x Width

4 x 3 = 12 square feet

Area

Area in square units of different rectangles: THINK - ARRAY

AreaExamples in the Real World:

Total space on the floor inside a room Carpet, Tile Floor