precalculus
posted by dave .
show that (1,1), (9,4), (20,6) and (10,1) are the vertices of a rhombus and then find the area of this rhombus?

precalculus 
Reiny
no they are not
just sketch it and find the slopes of the lines, none are equal
In a rhombus opposite sides should have the same slope and they must be equal in length.
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