the length of the face is the z co-ordinate of point A because that is the distance from the x axis to line AD
the height of the face is the y co-ordinate of point A because that is the distance from the x axis to the line AB
so times then use length x height
the height of the face is the y co-ordinate of point A because that is the distance from the x axis to the line AB
so times then use length x height
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