Fill in the blank to complete the trigonometric identity.
cos(-u)

i dont know what you want me to answer for this but im guessing 2: 11?

the solution, from the graphing of the two lines, is (3,2), i.e., x = 3, y = 2.

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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