angle-measuring instrument
nounA tool that tells you how wide or narrow an angle is.
The teacher used an angle-measuring instrument to show us that the corner of the square was exactly ninety degrees.
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OTHER MEANINGS
2. A protractor used in school geometry to measure and draw angles.
She placed the angle-measuring instrument on the paper to draw a sixty-degree angle.
3. A goniometer used by doctors to measure how far a joint can bend.
The physiotherapist used an angle-measuring instrument to check the movement in his knee.
4. An inclinometer that measures the slope or tilt of a surface.
The builder used an angle-measuring instrument to make sure the roof was not too steep.
5. A surveying instrument that measures angles between distant points.
The surveyor set up the angle-measuring instrument on a tripod to map the field.