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The Rectangle class also has width and height
methods, which answer with number instances representing the width and
height of the rectangle, and a center method, which answers with
a point instance representing the center of the rectangle. The center
coordinates are rounded to the nearest integer:
Workspace Transcript show: (Rectangle origin: 16@10 extent: 5@3) height printString; cr; show: (Rectangle origin: 16@10 extent: 5@3) width printString; cr; show: (Rectangle origin: 16@10 extent: 5@3) center printString; cr Transcript 3 5 18 @ 11