Видео ютуба по тегу Construct 165 Degree Angle With Set-Square
HOW TO USE SET SQUARE | CONSTRUCTION OF ANGLE 15°,30°,45°,60°,75°,90°,105°,120°,135°,150°,165°,180°
Construction of angle of 15, 30, 45, 60, 75, 90, 105, 120, 135, 150, 165 and 180 degree new