Multifunctional mathematical ruler for teaching

The utility model discloses a multifunctional mathematical ruler for teaching and belongs to the technical field of teaching aids. The mathematical ruler is composed of one equilateral triangle plate; a protractor is arranged on the bottom side of the triangle plate; a folding part is arranged from the middle point of the bottom side to a top point corresponding to the side; the two top points of the bottom side serving as start points, and beelines being respectively tangent to the protractor and serving as sides and the bottom side encircle to from the isosceles right-angled triangle plate; by regarding the top points of the isosceles right-angled triangle plate as the start points, a straight plate is arranged to be vertical to the lateral sides; the straight plate, the lateral sides and the folding part encircle to from a right-angled triangle plate. The multifunctional mathematical ruler for teaching has the functions of the right-angled triangle plate, the protractor and the ruler, can be folded, is con