| 摘要 |
The present invention relates to a mathematics tool such as a geometric mathematics template. The tool comprises a body having a 360 degree protractor with angularly spaced graduations and tracing edge extends about the protractor and includes a first tracing edge and a second tracing edge. The first and second tracing edges extend continuously over arcs covering at least 90 degrees and are marked with the angular graduations. In addition, the first and second tracing edges have different radii about a common centre. The mathematics tool enables a user to mark out any angle with ease. |
