In order to calculate the perimeter of the triangle, we have to calculate the distance between the three sets of points
The distance between (-4,1) and (1,1) is calculated as follows
distance =
distance =
dsitance =
distance between (-4,1) and (1,1) = 5 units
The distance between (1,1) and (1,-11) is calculated as follows
distance =
distance =
distance =
distance between (1,1) and (1,-11) = 12 units
The distance between (1,-11) and (-4,1) is calculated as follows
distance =
distance = 
distance =
distance between (1,-11) and (-4,1) = 13 units
Perimeter of the trainable = 5 + 12 + 13 = 30 units