It would be C:55,
hope this helps u out
Answer:
The points form a equilateral triangle of side 5.78 units.
Step-by-step explanation:
The length of the sides of the triangle is calculated using the distance formula.
The distance between the points (x₁,y₁) and (x₂,y₂) is

Now,
AB = 
BC = 
CA = 
The length of the sides of the triangle is 5.78. All the sides are equal in length. It is an equilateral triangle.
C it’s very easy if you want me to explain I will