Hadi B. answered • 05/22/19

BS in Mathematics with 5+ years of tutoring experience

find the distance between the two points using the distance formula

d = √[(-1-3)^{2} + (1+1)^{2}] = √(16 + 4) = √(20)

since these points are the endpoints of one side of the square use the formula for the area of a square

Area = (√20)^{2} = 20 square units