Arcs are great for making curvy vehicle shapes. A rocket might begin with rt 45, 200; rt 120; rt 45, 200. The wheels of a car might start with rt 360,20; lt 90; fd 60; lt 90; rt 540,20. Can you make a rocket or a car?
Arcs are useful for making organic shapes like a curved stem or a round petal of a flower. A flower with a single round petal might look like rt 30,200; rt 360,20. Can you draw a flower? Remember that you can switch pen colors in different parts of your drawing.