Protractors have to be half- circles because they measure angles less than 360 degrees.
they use protractors to measure circles
FullCircle Protractors HalfCircle Protractors Square Protractors Rectangular Protractors Military Protractors
You use protractors to measure angles. There is a ruler on the flat edge of most protractors, too. It's very handy!
A quadrant.
name of ballet move half circles made by pointed foot creating letter d on floor
The scapular protractors are muscles that move the shoulder blades outward and forward. The main scapular protractors include the serratus anterior and the pectoralis minor. These muscles play an important role in stabilizing the scapula during arm movements.
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Protractors
It depends on the type of protractor
Weather maps use half circles or triangles to show the direction and strength of wind. The direction in which the half circles or triangles point indicates the wind direction, while the number of half circles or triangles can indicate wind speed or intensity.
A venn diagram.
900 degrees