Rule *251 - Motions And Rules(a) A motion or rule shall be in writing and a copy thereof shall be served as provided by Pa.R.C.P. 233 (editor's note: now Pa.R.C.P. 440 and 441 ). Unless obviously self-apparent, the statute, a procedural rule or other authority for the motion or rule shall be cited in the supporting motion or petition.(b) A stay of proceedings may be allowed only by order of the court, and shall not be allowed except after notice to counsel of record for the adverse party unless the court in its discretion shall determine otherwise by reason of extraordinary circumstance.(c) If the relief sought depends entirely upon matters of record, a motion or rule may be entered as of course by filing with the prothonotary.(d) If the relief sought depends upon any matter not of record, the motion or rule shall be founded upon a petition. A rule to show cause thereon may be allowed only by the court, unless otherwise provided by statute or rule of court.(e) All averments in petitions on which rules to show cause have been granted may be taken as admitted for the purpose of the rule or citation unless an answer is filed thereto by the appropriate party.