Atriangle is graphed in the coordinate plane. the vertices of the triangle have coordinates (-4,1)(1,1), and (1,-11). what is the perimeter of the triangle?
a. 30
b.17
c. 25
d. 18

To answer the question above, determine the distance between the points which are the vertices of the triangle.

1. Between (-4,1) and (1,1) ;     d1 = sqrt ((1-1)² + (1--4)²) = 5
2. Between (-4,1) and (1,-11) ;  d2 = sqrt ((-11-1)² +(1--4)²) = 13
3. Between (1,1) and (1,-11) ;    d3 = sqrt ((-11-1)² + (1-1)²) = 12

The perimeter is the sum of the three distances. Thus, the perimeter of the triangle is 30. The answer is letter A. 

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