Answer:
The answer to your question is Perimeter = 26 units
Explanation:
Data
Vertex
A(-2, 3)
B (4, 7)
C (7, -1)
Process
1.- Find the distance between the vertex
dAB =

dAB =

dAB =

dAB =

dBC =

dBC =

dBC =

dBC =

dAC =

dAC =

dAC =

dAC =

Perimeter =

Perimeter = 7.21 + 8.54 + 9.84
Perimeter = 25.59 ≈ 26 units