Most of the protractors I've seen have been in the shape of a semicircle.
Chat with our AI personalities
The semi-circle ruler is commonly known as a protractor. A protractor is a geometric tool used to measure and draw angles. It typically has a half-circle shape with degree markings along the curved edge.
It will have an L shape flipped around at the corner. or you can use a protractor or type in google images 'right angle triangle' they will have an L shape at the corner of the right angled triangle.
A protractor measures the degree of angles and circles.
A protractor is normally used to construct angles.
With a protractor.