protractor
nounUK /prəˈtræk.tər/
US /proʊˈtræk.tɚ/
A protractor is a flat tool shaped like a half circle that you use to measure and draw angles.
She used a protractor to measure the angle of the triangle.
OTHER MEANINGS
2. A muscle that draws a body part forward or outward.
The protractor muscle helps move the arm forward.
3. A person or thing that protracts or lengthens something.
The device acted as a protractor of the metal rod.
4. An instrument for drawing or measuring angles, especially in surveying.
The surveyor checked the land with a protractor.