【實用工具app】Accurate Protractor|最夯免費app-綠色工廠好玩App

Using motion sensor to make sure your phone and your table ( or your board ) become 2 parallel planes. At this condition, camera can help you determine exact point of angle that you want.How to use1. you need to draw an angle to your paper for example angle ABC = 120 deg.2. open this application, put your phone on your paper, and then press button "Measure".3. lift your phone to above of your paper, rotate your phone so that the x and y value close to ( or equal ) zero, at this value your phone and your paper will be 2 parallel planes. Use a pen to mark the point A that satisfy angle ABC = 120 deg.ta ta, you 've got an angle ABC = 120 deg drawn on your paper without a real protractor.