Answer: P = 18 units.
Explanation:
To find the perimeter, we have to find the distance between coordinates AB, BC, CD, and DA (The order can be different depending on where the coordinates are, but It’s usually in that order). For this problem, I made A = (-8, 1), B = (-1, 1), C = (-8, 3), and D = (-1, 3). When plotting the coordinates, you can see that calculating the distance between B and C would be hard, so making the order AB, BD, DC, CA will make it easier for us. Since the shape is a rectangle, you can count the units/ figure out the distance without using the formula by plotting it on a graph (or even desmos graphing calc.). If you’d like to use the formula though,
it’s D = the square root of (x2 - x1)^2 + (y2 - y1)^2.
Distances:
AB = 7.
BD = 2.
DC = 7.
CA = 2.
Perimeter = AB + BD + DC + CA.
Perimeter = 7 + 2 + 7 + 2
Perimeter = 18 units.