Using the origin (0, 0) as the center of a circle, set the arc length and radius parameters of the circle with the sliders. Click on the green flag to see the circle. Click on See Inside and note that the green flag script is only two blocks long!
As a Logo-Lover, the 'Make a Block' ability in Scratch 2.0 let's me shorten code so that the logic of a program is easier to follow (and debug). 'Make a Block' is called a 'procedure' in Logo. Thanks Scratch 2.0 Team!