13)
from F to J it's 6 steps in x-direction and 3 steps in y-direction (up)
3/6 = 0.5
from J to H it's -2 steps in x-direction (to the left) and -4 steps in y-direction (down)
-4/-2 = 2
from G to H it's 6 steps in x-direction and 7 steps in y-direction (up)
7/6 = 1.1666666
14)
FG and JH are parallel
FJ and GH are parallel as well
meaning same slope
the other combinations are perpendicular (see screenshot)
15)
my brain needs rest. but just a hint: solve via pythagorean theorem, find the distance in x direction, and in y direction, then use a²=b²=c²
hope it gives you something
