Compass-Protractor / Stationery

"Compass-Protractor" puts the compass and the protractor together skillfully. It can help us to finish a perfect circle as well as to measure a given angle. With a Compass-Protractor we can also draw arcs with given angle and measure arc central angle.
Angle, arc length and circle are closely linked in geometry. With the functions of the "Compass-Protractor", students can discover this law and acquire knowledge efficiently. Besides, Compass-Protractor is easy to carry. As it puts two stationery together, it reduces the possibility of losing.