Duncan has cups of sand. He divides the sand equally into 4 containers.
He uses all the sand in 1 container to make pieces of sand art.
It takes cups of sand to complete each piece of sand art.

i hope this is what you were looking for.

see attached graph

perimeter = 10 +  √10  units

explanation:

first, we will need to get the length of each line using the distance formula which is as follows:

distance = 

1- length of ab:

ab =   = 5 units

2- length of ac

length of ac is the same as ab = 5 units

3- length of bc:

bc =   =  √10  units

now, we can get the perimeter by adding the side lengths as follows:

perimeter = 5 + 5 +  √10

perimeter = 10 +  √10  units

hope this : )

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how many friends does he have? i think some of the information got cut off in the problem.