Answer:
can you show the shapes
Step-by-step explanation:
Each face has a chance of 1/6
So you beed 6 rolls
First set up a proportion because they are similar triangles:
9/3x-20 = (72+9)/(56+3x-20)
9/3x-20 = 81/3x+36
9(3x+36) = 81(3x-20)
27x+324 = 243x-1620
1944 = 216x
x = 9
5
Should be your answer
Good luck
Http://www.personal.kent.edu/~bosikiew/Algebra-handouts/circles.pdf
I found this is may help but I don't know for sure.