Quadrangle - Strange word that...

I sometimes used to help in the infant school where Mrs.L worked. I remember one exercise where the children were supposed to recognise shapes containing a right angle. One pupil was autistic and when shown a semicircle, said that there were two right angles. The "correct" answer was none, but he insisted there were two. when I asked him why, he said that if you looked close into the corners, where the circumference met the diameter, there was a right angle. He was 8 years old and saw things in a very unique way.
 
Bretrick said:
Is there a Birangle? Is there a Trirangle?
How many Rangles are there?
Click to expand...
A quadrangle is a four-sided polygon, which means it has four straight sides and four angles. A triangle, on the other hand, is a three-sided polygon with three straight sides and three angles. They are geometric terms. Polygon is derived from both Latin and Greek, it means simply, many sides.

You have though, inadvertently, shown how sometimes language and it's origins get distorted. Julius Caesar's astronomers explained the need for 12 months in a year and the addition of a leap year to synchronise with the seasons. At the time, there were only ten months in the calendar, while there are just over 12 lunar cycles in a year. So, in 713 BC or BCE as it's now known, January and February were added to an original Roman calendar of only ten months.

January was named after Janus, a Roman god portrayed with two faces, one facing the past, and one facing the future. February is named after an ancient Roman festival of purification called Februa. To get back to your Latin polygon, quattuor is Latin for 4, novem is 9 and decem is 10.

The addition of January and February means that 9 & 10 have become 11 & 12. What a useless piece of information that you can bore everyone with.
 

Triangles classified by their angles​

The following table shows the types of triangles classified by their angles.

TypeAnglesFigure
Acuteall interior angles < 90°
acute.png
Obtuse1 interior angle > 90°
obtuse.png
Right1 angle = 90°
right.png
Equiangulareach interior angle = 60°
equiangular.png

Triangles classified by their sides​

The following table shows the types of triangles classified by their sides.

TypeSidesFigure
Scaleneno 2 sides are congruent
scalene.png
Isosceles2 congruent sides
isosceles.png
Equilateralall sides are congruent
equilateral.png
 
horseless carriage said:
A quadrangle is a four-sided polygon, which means it has four straight sides and four angles. A triangle, on the other hand, is a three-sided polygon with three straight sides and three angles. They are geometric terms. Polygon is derived from both Latin and Greek, it means simply, many sides.

You have though, inadvertently, shown how sometimes language and it's origins get distorted. Julius Caesar's astronomers explained the need for 12 months in a year and the addition of a leap year to synchronise with the seasons. At the time, there were only ten months in the calendar, while there are just over 12 lunar cycles in a year. So, in 713 BC or BCE as it's now known, January and February were added to an original Roman calendar of only ten months.

January was named after Janus, a Roman god portrayed with two faces, one facing the past, and one facing the future. February is named after an ancient Roman festival of purification called Februa. To get back to your Latin polygon, quattuor is Latin for 4, novem is 9 and decem is 10.

The addition of January and February means that 9 & 10 have become 11 & 12. What a useless piece of information that you can bore everyone with.
Click to expand...

I am not bored! Thank you; I truly found that very interesting. :)

Well, perhaps except for the part about why January is called January, and how February got its name; those I might consider boring. 😮 ☺️ :ROFLMAO:

But not the bulk of your post! Fascinating!🤓🤩🤗
 

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