angles set with different degrees. 15, 30, 45, 60, 75, 90, 105 and 120 degree. geometric and mathematical . flat line art

vector design icon school set geometry angle degree math measure geometric symbol education rotation 105 rotate mathematics sign graphic illustration shape isolated acute 30 mathematical circular science 90 60 right measurement 120 circle arrow angular coordinate white 45 line teach 75 architecture different arrows learn trigonometry system protractor mathematic pictogram