what are the red equilateral triangles we see on buildings for?

Question

its on the side of buildings... a whole column of red triangles... can be on the windows also...

Answer 1

Basically, the use of triangles in bridges or in structures, is for RIGIDITY.
Try this by pinning the ends of a stick forming a triangle, and applying a force by moving either one of the lengths. Did the traingle move? No, it won't move because of the rigidity principle. Triangle forms are often applied in bridges, as counter diagonals, in trusses of houses and in certain tall columns to prevent deflections.
When we speak of equilaterals, this means that the three sides or all of the sides of the triangle are equal. This may happen, at times depending on the design outcome. However, triangles in buildings vary in length, so, we may see isosceles triangles, sometimes.
The red ones we may observe, are probably the parts that are painted with anti-rust, but, some may be colored yellow or depending on what available color there might be.
We don't usually see red triangles exposed in buildings, but in bridges, it is predominant

Answer 2

You must ask your local authorities about this. Start with the fire dept., then try building inspection or industrial safety.
Back in the fifties we had blue circles w red triangles as a sign of civil defense shelter, or maybe only emergency food & first aid.
We also have signs that look like a patch of color, really meant for the fire dept., to show that chemicals, gases, or other hazardous materials are on site; this means different methods should be used to fight fire at that place.
It is also possible that the red triangle means the building is not earthquake resistant; this would be on older buildings.
Ask locally and add on to the Question if you find out.

Answer 3

To instruct that 40 3 is minimum using a laptop should be user-friendly, fantastically for someone who masters those children. For any (p,q,r) with 0<= p<= q

Answer 4

Knowing your country for sure would help; name suggests japan (which i can't help on) but of course it could really be anywhere

Officially placed triangles, or graffiti style? Might be gang symbols, gypsies, wifi-stealing warchalkers, freemasons, aliens, decoration :)

Answer 5

I don't recall ever seeing this. A picture or a better description would be helpful.

Answer 6

Must be a warning of some kind. I'm sorry but I really don't know.