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The term “drum radius” typically refers to the radius of the snare drum, which is the central drum in a standard drum kit. It is the drum that the snare wire sits on and gives it that unique sharp sound. The radius of a snare drum is not typically measured, but the size of the snare drum itself is usually between 13″-15″ in diameter. The larger the drum, the larger the radius.

However, the term can also be used to refer to the radius of any drum in a kit. In this case, the radius would be half the diameter of the drum. For example, a 14″ drum would have a radius of 7″.

But remember, these are just technical terms. In everyday use, people usually just refer to the size of the drum, not the radius.