5
Set squares are useful for drawing parallel lines and perpendicular lines.
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.
A staff in music is a set of horizontal lines and spaces. There is 5 lines and 4 spaces. Each represent a different pitch.
When you run out of lines on a musical staff, you can use ledger lines. These are short lines added above or below the staff to extend the range of notes that can be notated.
Staff lines
The musical staff contains five lines and four spaces.
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it was set in Liverpool
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Lines on a set is something the acters have to learn for the movie!
staff lines indicted pitch
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