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Perfect professional drawing or drafting stationery tool And Cheap Price. Great gift for students back to school from the holiday. Geometry Box is a Mathematical Drawing Instruments. Look inside for timetable And Formula sheet.
Plane (or Euclidean) geometry is the branch of mathematics that studies figures (such as points, lines, and angles) constructed only with the use of the straightedge and the compass. It is primarily concerned with such problems as determining the areas and diameters of two-dimensional figures. To determine geometric designs four important tools of geometry compass, straightedge, protractor, and ruler are used. Technically a true geometric construction with Euclidian tools, originally used by the ancient Greeks, uses only a compass or a straightedge. The ruler and protractor were later inventions. Today, the study of geometry is an essential part of the training of such professionals as mathematicians, engineers, physicists, architects, and draftspersons.
As early as 2000 b.c.e. geometers were concerned with such problems as measuring the sizes of fields and irrigation systems, and laying out accurate right angles for corners of buildings and monuments. Greek mathematician Euclid (c. 300 b.c.e.) and other geometers formalized the process of building geometrical figures with the use of specific tools. The ancient Greeks introduced construction problems that required a certain line or figure to be constructed by the use of the straightedge and compass alone. Simple examples are the construction of a line that will be twice as long as another line, or of a line that will divide a given angle into two equal angles.
Straightedge: A straightedge is a geometric tool used to construct straight lines. It contains no marks. As the name says, it is a "straight edge." A ruler can be used as a straightedge by simply ignoring the measuring marks on it.
Ruler: A ruler is a geometric tool used to measure the length of a line segment. A ruler is basically a straightedge with marks usually used for measuring either inches or centimeters. To use a ruler, place the zero mark on the point to begin the measurement. To stop measuring, look at the mark on the ruler that lies over the point at which the measurement is to end.
Compass: A compass is a V-shaped tool used to construct circles or arcs of circles. (See sketch below on left.) One side of the ""V"" holds a pencil and the other side is a point. The point anchors the compass at one location on the paper as the tool is turned so the pencil can trace circles, arcs, and angles. A compass is adjustable: the setting determines how far away from the point the arc would be located. Once the user determines the correct setting the compass is turned around its anchoring point so that the pencil creates a mark, an arc, or a full circle.
Protractor: A protractor is a geometric tool in the shape of a semicircular disk, as shown above on the right. It is used to measure the size of an angle in degrees—usually from 0 to 180 degrees. To use a protractor, lay the protractor on the angle to be measured. There will be a mark on the bottom of the protractor (the straight edge of it) indicating its middle. Place this mark over the origin of the angle, and align the straight edge of the protractor with one side of the angle. Where the other side of the angle intersects the protractor there will be a mark with a number next to it. This measurement is the measure of the angle.
Solving Construction Problems
Construction problems are generally solved by following six steps:
Provide a general statement of the problem that describes what is to be constructed.
Draw a figure representing the given parts.
Provide a statement of what is given in step 2.
Provide a specific statement of the result to be obtained.
Develop the construction, with a description (reason) for each step.
Provide a statement proving that the desired result was obtained.
|title||Matador i-teen Geometry Box-1 Set|
|categorys||Product স্টেশনারী জ্যামিতি বক্স|
|Product Quality||High Quality|
|Product Type||Geometry Box|
|Country of Origin||Bangladeshi|
|Tools Items||Total 1O items in a geometry box.|
|Tools Name||Heavy duty compass with adjusting ring. Every other components including eraser|
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