ABCD is a parallelogram on xy rectangular coordinate plane, three of the four vertices of parallelogram are (5,15) , (5,55) and (-5,15). Which can be the coordinate of fourth vertex? Choose one.
A) (15,55)	B) (5,15)	C) (-5,-25)	D) (-5,10)	E) (15,25)
(15,55)(-5, 15)   B(5, 15)   C(5, 55)   X(-5, 55): Parallelogram=Square=(15,55)XCB, where (15,55)X||CB, (15,55)X=CB, XC||(15,55)B, XC=(15,55)B   Y(-5, 5): Parallelogram=(15,55)YBC, where (15,55)Y||BC, (15,55)Y=BC, (15,55)C||YB, (15,55)C=YB   Z(15, 55): Parallelogram=(15,55)CZB, where (15,55)C||ZB, (15,55)C=ZB, CZ||(15,55)B, CZ=(15,55)B   (15,55)ns:(15,55)
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ABCD is a parallelogram on xy rectangular coordinate plane, three of the four vertices of parallelogram are (5,15) , (5,55) and (-5,15). Which can be the coordinate of fourth vertex?