Kiristie is making a pattern out of colored buttons for every 4 blue buttons kirstie uses she uses 3 green she has used 21 buton
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check the picture below.
recall that a cube sides are all equal in length, and it's really just 6 squares stacked up to each other at the edges.
so if 600 is the total area of those 6 squares, then just for one is 600/6 in².
