A quadrilateral with two pairs of parallel sides and all sides congruent is called a

a. rectangle.

b. square.

c. rhombus.

d. trapezoid.

Well you can say a square and a rhombus

hope this helps:)

x = ± 6i

step-by-step explanation:

x^2 = -36

take the square root of each side

sqrt(x^2) = sqrt(-36)

we know sqrt(ab) = sqrt(a) sqrt(b)

x = ±sqrt(36) sqrt(-1)

we know that sqrt (-1) = i

x = ± 6i