## Perimeter

Perimeter is the distance around a shape. To calculate a rectangle's perimeter, add its length and width, and multiply the sum by 2, since a rectangle has 2 sides that are the length, and 2 sides that are the width. When calculating the perimeter of a vertical rectangle, such as a window, use height instead of length.
For example, a rectangle is 3 feet long, and 4 feet wide. To calculate the perimeter, do the following:
```length    = 3 feet
width     = 4 feet
perimeter = (3 feet + 4 feet) × 2 = 14 feet
```

### Exercise 1 of 6

A standard piece of paper is 8.5 inches long, and 11 inches wide. How many inches is the perimeter?

### Exercise 2 of 6

A typical door is 80 inches high, and 30 inches wide. How many inches is the perimeter?

### Exercise 3 of 6

A standard ping-pong table is 9 feet long, and 5 feet wide. How many feet is the perimeter?

### Exercise 4 of 6

An NBA basketball court is 94 feet long, and 50 feet wide. How many feet is the perimeter?

### Exercise 5 of 6

Central Park in New York City is 2.5 miles long, and 0.5 miles wide. If you walked at 3 miles per hour, how many hours would it take to walk around Central Park?

### Exercise 6 of 6

Colorado is 280 miles long, and 380 miles wide. If you drove at 60 miles per hour, how many hours would it take to drive around Colorado?