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Thursday, January 11, 2024

A goniometer – what ? பாகைமானி !!

A goniometer – what ?   பாகைமானி என்றால் என்னவென்று தெரியுமா !

 


We learn a lot from children – here is a kid using Geometry for drawing – SYMA Childfest drawing competition held on 7.1.2024 !

 


We can measure Angles in Degrees.  There are 360 degrees in one Full Rotation (one complete circle around). Perhaps the first knowledge prize that we got in our school days was a Geometry box !  it was a set of basic equipment required for regular use in Schools in doing  diagram and graphs. The box usually consisted  of a compass, a 15cm ruler, a divider, 2 set squares and a protractor.  Protractors usually have two sets of numbers going in opposite directions. The outer scale starts from 0° and goes up to 180° in a clockwise direction, and the inner scale has the same range in the counterclockwise direction.  

பாகை என்பது கோணத்தை அளப்பதற்குரிய ஒரு அலகு ஆகும். இது 60 கலைக்குச் சமனானது ஆகும். இது ° என்னும் குறியீட்டினால் குறிக்கப்படுவது வழக்கம். 60° என எழுதும்போது அது 60 பாகை என்பதைக் குறிக்கும். ஒரு தளத்தில் அதிலுள்ள ஒரு புள்ளியை முழுவதுமாகக் சுற்றி அமையும் கோணம் 360 பாகை (360°) ஆகும்.  

வடிவவியலில், பாகைமானி அல்லது கோணமானி (Protractor) கோணங்களை அளவிடும், பொதுவாக ஊடுபுகக்கூடிய பேர்பெக்சாலான, ஒரு சதுர, வட்ட அல்லது அரை வட்டக் கருவியாகும்.  

A goniometer is an instrument that either measures an angle or allows an object to be rotated to a precise angular position. The term goniometry derives from two Greek words, γωνία (gōnía) 'angle' and μέτρον (métron) 'measure'.  Better known as the  protractor, it  is a commonly used type in the fields of mechanics, engineering, and geometry.   The first known description of a goniometer, based on the astrolabe, was by Gemma Frisius in 1538.

A protractor,  a measuring instrument, is  typically made of transparent plastic or glass, for measuring angles. Some protractors are simple half-discs or full circles. More advanced protractors, such as the bevel protractor, have one or two swinging arms, which can be used to help measure the angle.  Most protractors measure angles in degrees (°). Radian-scale protractors measure angles in radians. Most protractors are divided into 180 equal parts. Some precision protractors further divide degrees into arcminutes. A protractor divided in centiturns is normally called a "percentage protractor".

 
Interesting !
 
With regards – S Sampathkumar
11.1.2023 

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