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The most common protractor is a semicircle with 180 degrees marked on it. To draw or measure a full circle, you must flip the protractor over. A compass, on the other hand, can draw circles of different diameters depending on the placement of the center point and the length of angle between the center point and pencil.
Definition of divider 1 : one that divides. 2 dividers plural : an instrument for measuring or marking (as in dividing lines) 3 : something serving as a partition between separate spaces or areas a highway divider.
Dividers are one of the earliest and most basic types of mathematical instrument. In their simplest form, dividers consist of a jointed pair of legs, each with a sharp point. They can be used for geometrical operations such as scribing circles but also for taking off and transferring dimensions.
The instrument in the geometry box having the shape of a triangle are called set-squares.
The Geometer's Sketchpad includes the traditional Euclidean tools of classical geometric constructions. It also can perform transformations (translations, rotations, reflections, dilations) of geometric figures drawn or constructed on screen. It is far more than a construction or transformation tool, however.
The terms compass and divider are often interchanged, for each instrument can be used to draw circles, mark divisions (divide a given distance), or simply mark a distance. Technically, a compass is a drafting instrument that has one pen or pencil point and one sharp point that…
The distance between the divider is adjustable and it is used to measure and compare lengths. They could be used for geometric tasks including scribing circles, but also for measurements being taken off and moved.
compass (n.) The mathematical instrument for describing circles was so called in English from mid-14c. The mariners' directional tool (so called since early 15c.) took the name, perhaps, because it's round and has a point like the mathematical instrument. Meaning "limits, boundary" is from 1550s.
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A protractor is a simple measuring instrument that is used to measure angles. A common protractor is in the shape of a semicircle with an inner scale and an outer scale and with markings from 0° to 180° on it.
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