A rectangular 180 degree protractor with integrated straight edge and metric ruler.
Students are encouraged to draw angles as well as to measure them when using this creative design tool. This happens because the design of this tool integrates two parallel straight edges with a conventional 180 degree protractor at their centre. The varying length of the degree lines in this tool challenges students to conceptualise angle as rotational distance. This may help in overcoming the common misconception by students that the length of the rays of an angle determine its magnitude.
Compact and flexible for convenient storage in a pencil case or folder.
A great alternative to the traditional 180 degree protractor