Question

is ab perpendicular to cd A(0,2) B(-3,-3) C(-4,1)D(0,-2)

Answer 1

Find the slopes of the 2 line segments and see if they are negative reciprocals then the lines are perpendicular.
AB slope is -3-2/-3-0= -5/-3=5/3
CD slope is -2-1/0- -4=-3/4

The lines are not perpendicular