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Protractor
(redirected from protractors)

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protractor

Instrument for constructing and measuring plane angles. The simplest protractor is a semicircular disk marked in degrees from 0° to 180°. A more complex protractor, for plotting position on navigation charts, is called a three-arm protractor, or station pointer, and consists of a circular scale connected to three arms. The centre arm is fixed, while the outer two can be rotated to any desired angle relative to the centre one. A related instrument is the course protractor, which allows navigators to measure the angular distance between north and the course plotted on a navigation chart.

protractor
1. an instrument for measuring or drawing angles on paper, usually a flat semicircular transparent plastic sheet graduated in degrees
2. a surgical instrument for removing a bullet from the body
3. Anatomy a former term for extensor
protractor [′prō‚trak·tər]
(engineering)
A semicircular instrument used to construct and measure angles formed by intersecting lines of a plane; the midpoint of the diameter of the semicircle is marked and serves as the vertex of angles constructed or measured.
protractor
An instrument graduated in angular degrees for measuring or laying out angles.
Protractor 

an instrument used to construct and measure angles in sketches and on charts. A protractor consists of a straightedge and a semicircle that is graduated in degrees from 0° to 180°. The precision of a protractor increases as its size becomes larger: the larger the semicircle, the smaller the value of a division. Protractors for very precise construction and measurement of angles—for example, in navigation—are equipped with a transparent straightedge and a goniometric vernier that rotates about the midpoint of the diameter of the semicircle.
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Several months later we were using the protractors while introducing the unit circle.
Using tool-making to contextualise geometry: the super-size protractor by Sheppard, Ian / Australian Mathematics Teacher
I prefer clear protractors so I can highlight my desired angle with a permanent marker.
Finding your spot in the sun: Arthur Dougherty helps you pinpoint ... by Dougherty, Arthur / New Life Journal
 
 
 
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