As a trip to a theme park will show you, there are dozens of ways to design a vending cart. But they all have several elements in common. The vending cart must be able to hold a certain amount of food or drink, depending on several factors:

• how busy the park is during the day
• how frequently someone can bring supplies to refill the cart

In designing a vending cart, you may want to take a look at several different types
to see a variety of push cart designs as well as a drawing of the interior of a cart.

If you find you have problems visualizing a three-dimensional shape such as a vending cart, you might want to grab some heavy-weight paper, such as construction paper or index cards, scissors, and tape, and make a model of the object you want to design. This will help you understand the difference between area, perimeter and volume.