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.

Question

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The Answer of 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.

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

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