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To call us in for dinner, Mom used to ring an iron triangle.
You use it in Chemistry Class It is used to hold a crucible on the iron ring.
The Triangle is my favorite shape.
you use iron for ironing your clothes,
Here is a very complete article on how to use the triangle www dot wikihow dot com/Play-the-Triangle
You may be talking about a pipe stem triangle used in Chemistry. It is composed of twisted wires running through three clay pipes in the shape of an equilateral triangle. It is placed on an iron ring attached to a ring stand, and it holds a crucible over the flame of a Bunsen burner. Enter the keywords "pipe stem triangle" at Flinnsci.com and see if that's what you're talking about.
Pythagoras's Theorem is used to determine if a triangle is a right triangle or not.
They use Fe for Iron.
To circumscribed a circle about a triangle you use the angle. This is to get the right measurements.
The way you use a scale factor to enlarge a triangle is to multiply each side of the triangle by that scale factor. Your triangle will then be that many times larger.
An iron.
tHEY used iron to make iron out of iron.