D Half 4" Protractor-Semi-Circle has diameter of 15 cm. Scale in degrees rotation is 90°. A protractor is an instrument for measuring angles, typically in degrees.

D Half 6" Protractor-Semi-Circle has diameter of 15 cm. Scale in degrees rotation is 180°. A protractor is an instrument for measuring angles, typically in degrees.

D Half 10" Protractor Semi Circle has diameter of 15 cm. Scale in degrees rotation is 70°. A protractor is an instrument for measuring angles, typically in degrees.

Round D Protractor 360 Degree A protractor is an instrument for estimating points, ordinarily in degrees. Made with transparent clear plastic. Easy to read inch and centimeter. Accurate and long lasting prints. 360 degree protractor is perfect for measuring angels greater than 180 degrees....

D Half 8" A semicircle is a half circle, formed by cutting a whole circle along a diameter line, as shown above. It is use for measuring the angle, to find angle like 90°.