Patent ID: 6978550

Claim:
A protractor and ruler combination, comprising a main ruler, a secondary ruler, and an auxiliary ruler, wherein: the main ruler has a first side integrally formed with a protractor having a plurality of scales, with the protractor having a semi-circular shape and a center; the secondary ruler is separately formed from the main ruler, wherein the secondary ruler has a semi-circular shape and a center, wherein the secondary ruler has a plurality of reading scales; and the auxiliary ruler is separately formed from the main ruler and the secondary ruler, wherein the auxiliary ruler has a center, with the main ruler, the secondary ruler and the auxiliary ruler rotatably mounted about the centers of the protractor, the secondary ruler, and the auxiliary ruler with the secondary ruler sandwiched between the main ruler and the auxiliary ruler, with the auxiliary ruler being removably secured to the secondary ruler so that the secondary ruler is moved in concert with the auxiliary ruler on the protractor of the main ruler.