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The triangle is an idiophone type of musical instrument in the percussion family. It is a bar of metal, usually steel but sometimes other metals like beryllium copper, bent into a triangle shape.
The instrument is usually held by a loop of some form of thread or wire at the top curve. It was first made around the 16th century.
On a triangle instrument, one of the angles is left open, with the ends of the bar not quite touching.
This causes the instrument to be of indeterminate or not settled or decided pitch.
It is either suspended from one of the other corners by a piece of, most commonly, fishing line, leaving it free to vibrate, or hooked over the hand.
It is usually struck with a metal beater, giving a high-pitched, ringing tone.
Although the shape is today generally in the form of an equilateral triangle, early instruments were often formed as isosceles triangles.
In the early days the triangles did not have an opening and had jingling rings along the lower side.
The triangle is very common for samba and many other styles. It is played with a metal beater in the righ hand and the sound can be muted by the left hand which holds the triangle. Following are some examples of very popular samba patterns.
CREDITS Thanks to Wikipedia for part of the instrument description