
An instrument used to draw an angle:
A. Scale
B. Divider
C. Protractor
D. None of these
Answer
564.6k+ views
Hint: Here to draw an angle, the instrument used is called a protractor. A protractor is a measuring instrument, typically made of transparent plastic or metal, for measuring angles. Some protractors are simple half-discs. More advanced protractors, such as the bevel protractor, have one or two swinging arms, which can be used to help measure the angle.
Complete step-by-step answer:
Protractor, any of a group instruments used to construct and measure plane angles. The simplest protractor comprises a semicircular disk graduated in degrees from to .
It is an ancient device that was already in use during the $ 13^{th} $ century. At that time, European instrument makers constructed an astronomical observing device called the torquetum that was equipped with a semicircular protractor.
So how to measure an angle with a protractor is to place the midpoint of the protractor on the vertex of the angle. Line up one side of the angle with zero line of the protractor (where you see the number 0). Read the degrees where the other side crosses the number scale.
Take care to read from the right set of numbers. A protractor has two sets of numbers: one set goes from 0 to 180, the other set from 180 to 0. Which one you read depends on how you place the protractor, place it so that one side of the angle lines up with one of the zeros, and read that set of numbers.
So, the correct answer is option C.
Note:
Please note that there are many other devices to measure the angles, other than the instrument protractor, such as : navigational plotter, the sextant, the theodolite, miter saw, goniometer, inclinometer. The protractor has many types such as the three-arm protractor, station pointer etc.
Complete step-by-step answer:
Protractor, any of a group instruments used to construct and measure plane angles. The simplest protractor comprises a semicircular disk graduated in degrees from to .
It is an ancient device that was already in use during the $ 13^{th} $ century. At that time, European instrument makers constructed an astronomical observing device called the torquetum that was equipped with a semicircular protractor.
So how to measure an angle with a protractor is to place the midpoint of the protractor on the vertex of the angle. Line up one side of the angle with zero line of the protractor (where you see the number 0). Read the degrees where the other side crosses the number scale.
Take care to read from the right set of numbers. A protractor has two sets of numbers: one set goes from 0 to 180, the other set from 180 to 0. Which one you read depends on how you place the protractor, place it so that one side of the angle lines up with one of the zeros, and read that set of numbers.
So, the correct answer is option C.
Note:
Please note that there are many other devices to measure the angles, other than the instrument protractor, such as : navigational plotter, the sextant, the theodolite, miter saw, goniometer, inclinometer. The protractor has many types such as the three-arm protractor, station pointer etc.
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