Answer: 474
Step-by-step explanation: first you multiply from top to side ( or side to bottom ) so first we will do 12 x 8 12x8=96 then we multiply 21x18=378 then we add are answer up and the you get.... 474.
Answer:
If you mean the sum of internal angles of the n-gon is 6 right angles,
we use the formula 180*(n-2) = 6*90
or n-2 = 6*90/180
or n - 2 = 3
or n = 5
So it is a pentagon or 5-gon
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