I think I have to prove that the other opposite sides are also parallel, but I am not sure how to do it. It is given that the other opposite sides are congruent and parallel.
Find the area of the parallelogram spanned by the vectors <1, 0, -1> and <-2, 2, 0>.
I have troubles with dot products.
I have been having trouble with parallelograms.
Prove that ABDE is a parallelogram and prove that if the altitudes on AC from d and b are egual,then AC bisects bd
the shape is a parallelogram there is x________________w
Quad. DECK is a parallelogram. Complete.