Car Wheels (the 'why' of shapes)

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Car Wheels are a round circle shape, but would cars work with any other shapes as wheels? let’s find out!
Squares and Triangles:

Would Squares and Triangles work as wheels on a car? The answer is no. The car would be slow and bumpy and hard control.

Ovals:

Would Ovals work as a wheels on a car? The answer is no. Because the circumference of an oval is not consistent enough to rotate fully and make the car move. And when the car moves it would be bumpy.

What about the size of Wheels?
The size of wheels has to be the same measurement on every side of the circle, or it would be really bumpy.

— Faye Murray (S1)