## Perimeter and Area

When first learning about geometry, it is important to understand two main concepts: PERIMETER and AREA. Today you are going to learn how to calculate the PERIMETER and AREA of basic shapes.

## Perimeter

The Smith family decides they want to build a fence around their backyard. They need to go to the hardware store to buy fencing. How much fencing will they need to buy?

In order to figure out how much fencing the Smith family will need, they must find the PERIMETER of their backyard. So what is PERIMETER?

PERIMETER is the distance around a figure.

Take a look at the examples below to calculate PERIMETER:

In order to figure out how much fencing the Smith family will need, they must find the PERIMETER of their backyard. So what is PERIMETER?

PERIMETER is the distance around a figure.

Take a look at the examples below to calculate PERIMETER:

Let's go back to the Smith family. If their backyard is 30 feet wide and 40 feet long, how much fencing would they need to buy?

Calculate the PERIMETER: 30 + 40 + 30 + 40 = 140

They need to buy 140 feet of fencing.

## Area

After fencing their yard, the Smith's decide they need to get purchase new grass (or sod) for their lawn. How much sod do they need to get?

Perimeter tells us the distance around a figure, but AREA is the number of square units needed to cover a figure. To help the Smith's, we must find the AREA of their backyard.

AREA is the number of square units in a region.

Take a look at the examples below to calculate AREA:

Perimeter tells us the distance around a figure, but AREA is the number of square units needed to cover a figure. To help the Smith's, we must find the AREA of their backyard.

AREA is the number of square units in a region.

Take a look at the examples below to calculate AREA:

Let's go back to the Smith family again. If their backyard is 30 feet wide and 40 feet long, how much sod would they need to buy?

Calculate the AREA: 30 x 40 = 1,200

They need to buy 1,200 square feet of sod.

View the presentation below on PERIMETER and AREA:

Calculate the AREA: 30 x 40 = 1,200

They need to buy 1,200 square feet of sod.

View the presentation below on PERIMETER and AREA: