Question is in the screenshot below.

no not all of them.

step-by-step explanation:

some of them have a square base.

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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answers

m = 0

n = 0.

explanation

most of the values are negative. the one that are not negative are the excluded   values.

these values are: m = 0

                              n = 0.