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A "protractor" is a device that can be used to draw angles of a specified size, or measure the size of unknown angles, in the same way that a "ruler" is used to do the same thing with lines.
No, but both are used to measure distance.
The Pythagorean theorem is commonly used in everyday life for various applications such as construction, architecture, and design. It helps in calculating distances, dimensions, and angles in right-angled triangles. For example, it can be used to determine the length of a ladder needed to reach a certain height or to calculate the diagonal distance of a square-shaped object.
Not normally. A protractor is generally used to measure angles.
To avoid confusion as to which vertex or side you are talking about.