Triangle (instrument) facts for kids
The player holds a small piece of string or leather from which the triangle is hanging, and he makes a sound by hitting the triangle with a triangle beater. In orchestras, where the percussionist may be playing several percussion instruments, the triangle may hang from a stand so that the player can move quickly to another instrument.
Triangles come in different sizes. Smaller ones will sound higher than larger ones.
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Triangle (instrument) Facts for Kids. Kiddle Encyclopedia.