Abstract: A drawing board assembly includes a board having two tracks and two slide bases are movably received in the tracks. A ruler is connected between the two slide bases and a frame is connected to the ruler. The frame has a groove in which a slide member is movably received. A protractor is connected to the slide member and a guide ruler is pivotally connected to the protractor. A bolt extends through the guide ruler and the protractor. A positioning knob is connected to the bolt so that when the bolt is loosened, the guide ruler is pivoted.

Abstract: A drawing board assembly includes a rectangular board including two opposite end portions each having a side wall transversely defining an elongate guiding track therein and a top wall. Two inverted L-shaped sliding bases are each slidably supported on a corresponding one of the two end portions of the board and each include a first plate abutting on the top wall and a second plate abutting on the side wall. Two slides are each fixedly mounted on the second plate of a corresponding one of the two sliding bases and are each slidably received in the guiding track A ruler is slidably mounted on the board, and an elongate frame is fixedly mounted on the ruler and includes two end portions each connected with the first plate of a corresponding one of the two sliding bases.