Answer:
20-gon
Step-by-step explanation:
First we start with the formula to find what the sum of angles will be if we know the number of sides.
S=(n-2)*180 where S is the sum of angles and n is the number of sides.
Normally you'd plug in n to find S, but you can do the opposite too.
3240=(n-2)*180
Let me know if you need help working it from here.
The nearest 10 is 50 and the the nearest hundred is 900
20 cups
4 rows of 5 containing the 3 inch cups and 5 columns of 4 containing the 3 inch cups
