# Who discovered circle theorems?

**Asked by: Shawn Davis**

Score: 4.8/5 (32 votes)

The first theorems relating to circles are attributed to **Thales around 650 BC**. Book III of Euclid's Elements deals with properties of circles and problems of inscribing and escribing polygons. One of the problems of Greek mathematics was the problem of finding a square with the same area as a given circle.

## Who is the father of circle?

**Prof.** **Kaoru Ishikawa** advocated forming “QC Circle” in order to educate and promote Quality Control for front-line workers in the workplace, on the way to realize Total Quality Control, and strived to promote it by establishing the QC Circle Headquarters, within JUSE, in 1962 for systemization.

## What is the first circle theorem?

First circle theorem - **angles at the centre and at the circumference**. Second circle theorem - angle in a semicircle. Third circle theorem - angles in the same segment. Fourth circle theorem - angles in a cyclic quadlateral.

## What are the 6 main circle theorems?

- Circle Theorem 1 - Angle at the Centre.
- Circle Theorem 2 - Angles in a Semicircle.
- Circle Theorem 3 - Angles in the Same Segment.
- Circle Theorem 4 - Cyclic Quadrilateral.
- Circle Theorem 5 - Radius to a Tangent.
- Circle Theorem 6 - Tangents from a Point to a Circle.
- Circle Theorem 7 - Tangents from a Point to a Circle II.

## What are the 4 circle theorems?

**Circle theorems: where do they come from?**

- The angle at the centre is twice the angle at the circumference.
- The angle in a semicircle is a right angle.
- Angles in the same segment are equal.
- Opposite angles in a cyclic quadrilateral sum to 180°

## Everything About Circle Theorems - In 3 minutes!

**31 related questions found**

### Who invented math?

**Archimedes** is known as the Father of Mathematics. Mathematics is one of the ancient sciences developed in time immemorial.

### Does a perfect circle exist?

**Perfect circles do not exist in nature**, but you can see some close approximations around CMU's main campus in Pittsburgh.

### How is circle used in real life?

Some examples of circles in real life are camera lenses, pizzas, tires, Ferris wheels, rings, steering wheels, cakes, pies, buttons and a satellite's orbit around the Earth. **Circles are simply closed curves equidistant from a fixed center**. Circles are special ellipses that have a single constant radius around a center.

### Why is circle important in our life what would the world be like without circles?

Life without circles would be **as a square**. All the planets including earth would not exist in a circular shape. There would be no movement of wheels of cars and bicycles on the road. Also scientific terms like rolling friction would not exist.

### Why is circle important in our life?

Circles are still symbolically important today -they are **often used to symbolize harmony and unity**. For instance, take a look at the Olympic symbol. It has five interlocking rings of different colours, which represent the five major continents of the world united together in a spirit of healthy competition.

### Can humans draw a perfect circle?

**Drawing a perfect circle by hand is impossible**. The human brain doesn't have the precision or resources to draw an ever curving circle by hand. Until someone discovers the exact value of π, perfect circles will remain a mathematical concept only possible as an idea.

### What shape does not exist in nature?

Mathematical shapes can exist in various dimensions. They can also be defined very specifically. **A mathematical circle** doesn't exist in nature because a) it is a two dimensional object and b) shapes in nature are quantised – at some point a flower is made of cells and then atoms.

### Is Pi an infinite?

No matter how big your circle, the ratio of circumference to diameter is the value of Pi. Pi is **an irrational number---**you can't write it down as a non-infinite decimal.

### Who found zero?

The first modern equivalent of numeral zero comes from **a Hindu astronomer and mathematician Brahmagupta** in 628. His symbol to depict the numeral was a dot underneath a number.

### Why is math so hard?

**Math seems difficult because it takes time and energy**. Many people don't experience sufficient time to "get" math lessons, and they fall behind as the teacher moves on. Many move on to study more complex concepts with a shaky foundation. We often end up with a weak structure that is doomed to collapse at some point.

### Who is known as father of trigonometry?

The first known table of chords was produced by the Greek mathematician **Hipparchus** in about 140 BC. Although these tables have not survived, it is claimed that twelve books of tables of chords were written by Hipparchus. This makes Hipparchus the founder of trigonometry.

### What is a perfect shape?

A two-dimensional equable shape (or perfect shape) is **one whose area is numerically equal to its perimeter**. For example, a right angled triangle with sides 5, 12 and 13 has area and perimeter both have a unitless numerical value of 30.

### Why do circles exist?

**Because of their symmetry**, circles were seen as representations of the “divine” and “natural balance” in ancient Greece. Later on, the shape would become a vital foundation for the wheel and other simple machines. A focus on circles is evident among structures built throughout history.

### Do triangles exist nature?

The first geometric shapes that can be created with the least amount of lines or points are Triangles. This representation of 3 can be found widely in **natural forms** from leaf forms to vegetables on your dinner plate, a natural triangle is probably seen everyday.

### Are you a psychopath if you can draw a perfect circle?

Contrary to the Urban Myth, being able to draw **a perfect** or near perfect circle free hand does not indicate insanity or sociopathy. ... Over time, this near-supernatural act has mutated into a sign of insanity or indicative of psychopathy.

### What is the hardest thing to draw in the world?

**List Of The Top 10 Hardest Things To Draw**

- Hands.
- Faces.
- Hair.
- The Other Eye.
- Horses.
- Vehicles.
- Skulls.
- Alligators.

### Who could draw a perfect circle?

Vasari also relates that when Pope Benedict XI sent a messenger to **Giotto**, asking him to send a drawing to demonstrate his skill, Giotto drew a red circle so perfect that it seemed as though it was drawn using a pair of compasses and instructed the messenger to send it to the Pope.

### What is circle shape?

A circle is a **shape consisting of all points in a plane that are at a given distance from a given point, the centre**; equivalently it is the curve traced out by a point that moves in a plane so that its distance from a given point is constant.

### What are the properties of a circle?

**Circle Properties**

- The circles are said to be congruent if they have equal radii.
- The diameter of a circle is the longest chord of a circle.
- Equal chords of a circle subtend equal angles at the centre.
- The radius drawn perpendicular to the chord bisects the chord.
- Circles having different radius are similar.