Describe and correct the error in the problem. plz do the correction  right.

Vertical angles share a vertex, and have the same lines for sides, but do not have a side in common. Angles ACB and BCD have side BC in common, so cannot be vertical angles.

Angles ACB and ECF are vertical angles.

There is no vertical angle in the diagram corresponding to ∠BCD, as ray CD is not part of a line that passes through point C.

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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