What’s his angle? Teen frustrated by plastic protractor reimagines the classic classroom tool

Wenxin Fang of Redmond, Wash., holds the ZeroPivot Protractor that he designed and is selling through a new Kickstarter campaign. (Photo courtesy of Wenxin Fang) Wenxin Fang was 14 years old when he realized he was fed up with fighting with a flimsy piece of plastic in math class. As an eighth grader at Evergreen Middle School in Redmond, Wash., Fang kept bumping into the limits of standard classroom protractors — the cheap, clear tools generations of students have used to measure and plot angle