Answer:
y = 120º
Step-by-step explanation:
180 - (33 + 87) = 60
x = 60
180 - 60 = 120
y = 120º
or y = 33 + 87, because the outer angle of one angle equals the other two inner angles.
Can you show us the triangular prism to help you
You are dividing a number (x) by three and then subtracting 1 like this. (x/3)-1
