Shape-changing multi-purpose ruler

The utility model relates to a deforming multi-purpose ruler used for metering, measuring or drawing, etc., which is composed of deforming sections, wherein, the heads and the tails of which are connected. Each section is mutually connected together by a rotation shaft which is perpendicular to an inclined plane. An end ruler face is provided with an angle dial and an angle indicating needle, and the long and the short shapes of each section are given by geometrical relation. The utility model has the advantages of simple structure, one object with multiple functions and quite convenient use and carryover. A straightedge, a triangular device and a protractor are gather into an integral body.