For the Points $A ( 4 , - 1 , - 1 ) , B ( - 1 , - 2,4 ) , C ( 5 , - 4,4 ) , D ( 0 , - 5,9 )$

question 44

Essay

For the points $A ( 4 , - 1 , - 1 ) , B ( - 1 , - 2,4 ) , C ( 5 , - 4,4 ) , D ( 0 , - 5,9 )$ :
a. Verify that the points are vertices of a parallelogram. Show all work.
b. Find the area of the parallelogram. Show all work.
c. Determine whether the parallelogram is a rectangle.

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