Convert each of the following rectangular equations to p 19. x + y = 9
20. y = 4
Convert each of the following polar equations to rectangular form. 22. r = -5 sec B
23. r = 4 sin
24. r = 4

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If the angle bisectors of a pair of opposite angles of a quadrilateral are the opposite sides of a parallelogram formed by the two angle bisectors and two sides of the quadrilateral, is the quadrilateral always a parallelogram? explain your answer.