staff A set of musical lines is called a staff or musical staff; more than one set; i.e. plural , would be staves. A set of musical lines is called a staff or musical staff; more than one set; i.e. plural , would be staves.
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Set squares are useful for drawing parallel lines and perpendicular lines.
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A musical staff.... For Bass and Treble
A trapezoid, trapezium and a pentagon have only 1 set of parallel lines.
Depending on the measurement of the angles they form it could be a perpendicular set, or they would be called askew lines.