Kermit: The domain of gt is Number, String, String.
Oscar: The domain of gt is Number.
Ernie: I’m not sure who’s right!
In order to make a triangle, we need a size, a color and a fill style…
but all we had to tell our actor was (gt 20)…and they returned (triangle 20 "solid" "green").
Please help us!
1 What is the correct domain for gt?
2 What could you tell Ernie to help him understand how you know?
These materials were developed partly through support of the National Science Foundation, (awards 1042210, 1535276, 1648684, 1738598, 2031479, and 1501927). 
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