A
protractor is a square, circular or semicircular tool, typically made of transparent plastic, for measuring angle s. Most
protractorsKaynak: ProtractorMany modern compasses incorporate a baseplate and
protractor tool, and are referred to variously as "orienteering ", "baseplate", "map
Kaynak: Compasstechnical drawing , consisting of a pair of scales mounted to form a right angle on an articulated
protractor head that allows an angular rotation
Kaynak: Drafting machineMore commonly the set square bears the markings of a ruler and a half circle
protractor . The outer edges are typically bevel led.
Kaynak: Set squareHe was a pioneer writer in English in several areas, and inventor of a standard classroom geometrical instrument, the
protractor .
Kaynak: Thomas BlundevilleDifferent drawing instruments (set square ,
protractor , etc.) are used on it to draw parallel, perpendicular or oblique lines.
Kaynak: Drawing boardMost instruments are used within the field of geometry , including the ruler , dividers ,
protractor , set square , compass, ellipsograph
Kaynak: Mathematical instrumentKjellström, and Björn Kjellström - invented the hugely popular orienteering or
protractor compass used around the world for outdoors navigation.
Kaynak: Silva compassThese postulates are all based on basic geometry that can be confirmed experimentally with a scale and
protractor . Since the postulates
Kaynak: Birkhoff's axiomsan existing angle, or set to a desired angle by using it with any number of other measuring tools (such as a
protractor , or framing square
Kaynak: Sliding T bevelIf fitted with
protractor s, it could be used to measure angles . Use: Greek astronomers used the dioptra to measure the positions of stars
Kaynak: DioptraThe term may be used to include not only stationery , but such items as pocket calculator s, compasses and
protractor s, lunchbox es, and
Kaynak: School suppliesused in surveying which consists of a fixed sighting tube, a movable spirit level that is connected to a pointing arm, and a
protractor scale.
Kaynak: Topographic Abney LevelA rolling ruler can draw straight, parallel lines, and also has other instruments included, enabling it to do the jobs of a
protractorKaynak: Rolling ruler