# Who Invented The Protractor?

## Who invented trigonometry?

Trigonometry in the modern sense began with the Greeks.

Hipparchus (c.

190–120 bce) was the first to construct a table of values for a trigonometric function..

## What is a triangle protractor called?

The simplest form of set square is a triangular piece of transparent plastic (or formerly of polished wood) with the centre removed. More commonly the set square bears the markings of a ruler and a half circle protractor. The outer edges are typically bevelled.

## What is the least count of protractor?

Bevel Protractor is an angular measuring instrument capable of measuring angles with a least count of 5′. learn more about angle measurement instruments in our Advance Engineering Metrology Course. The protractor dial is graduated in degrees with every tenth degree numbered.

## Who is father of trigonometry?

Hipparchus of NicaeaHipparchus of Nicaea (/hɪˈpɑːrkəs/; Greek: Ἵππαρχος, Hipparkhos; c. 190 – c. 120 BC) was a Greek astronomer, geographer, and mathematician. He is considered the founder of trigonometry but is most famous for his incidental discovery of precession of the equinoxes.

## Who invented the angle?

Chester HallAlthough originally invented by Chester Hall in 1733 it was kept secret for 26 years. In 1725 an instrument, recognisable as a Theodolite, was produced by the workshop of Jonathan Sissons.

## Why is it called a protractor?

By the seventeenth century, protractors were standard tools for navigation at sea by sailors. This protractor was named three arm protractor because it had a circular scale and three arms. Two arms are rotatable, and one central arm is fixed so protractor can set any angle relative to the center arm.

## What are the 7 types of angles?

Types of Angles – Acute, Right, Obtuse, Straight and Reflex…Acute angle.Right angle.Obtuse angle.Straight angle.Reflex angle.

## Who invented math?

Beginning in the 6th century BC with the Pythagoreans, the Ancient Greeks began a systematic study of mathematics as a subject in its own right with Greek mathematics. Around 300 BC, Euclid introduced the axiomatic method still used in mathematics today, consisting of definition, axiom, theorem, and proof.

## What is the meaning of protractor?

1a : one that protracts. b : a muscle that extends a part. 2 : an instrument for laying down and measuring angles in drawing and plotting.

## What is a protractor used for?

GeometryProtractor/Calculation supported

## What is a protractor in math?

more … An instrument used in measuring or drawing angles.

## Does the size of a protractor matter?

Protractor markings are spaced differently based on their size (which you can see by putting one protractor on top of another) so no matter what, the same angle has the same measurement.

## Who is the father of mathematics?

ArchimedesThe word “mathematics” is derived from the Greek word “mathema” meaning knowledge. It includes the study of concepts such as number theory, algebra, mathematical analysis, etc. Archimedes is known as the Father Of Mathematics. He lived between 287 BC – 212 BC.

## What is the middle of a protractor called?

The baseline, also known as the zero edge, has a small circle at its midpoint. This is the center mark, or origin point. Place the protractor on one arm of the angle, lining up the center mark with the vertex (the point at which the two lines meet).

## How does a protractor work?

The Selenium Server takes care of interpreting commands from the test and forwarding them to one or more browsers. Communication between the server and the browser uses the WebDriver Wire Protocol, a JSON protocol. The command is interpreted by the Browser Driver. With Protractor, the test script is run using Node.

## How many types of protractors are there?

Protractor and circular protractor Semicircular protractor has two scales; each graduated up to 180 degrees (π radian). The scale of circular protractor graduated up to 360 degrees (2π radian). The circular protractor is widely used for engineering drawings. The square and rectangular protractor are also available.

## What is another name for protractor?

Protractor Synonyms – WordHippo Thesaurus….What is another word for protractor?enlargerexpanderlengthenerstretcher1 more row

## What is the shape of protractor?

Circular. Shaped like a circle, the circular protractor scale is graduated up to 360 degrees in the clockwise direction from the astronomical north reference point.