Generally it is 8x12 inches.
circumference
coefficient of expansion
A century.
The diameter is 24.26 mm (0.955 inches) Note that a quarter is circular so it doesn't actually have a length, which describes linear distance.
a demisemiquaver is the length of half a semiquaver
It is called duration.
A quaver is half the length of a crotchet. A semi quaver is a quarter of a crotchet's length . A minum is double its length while a dotted minum is three times it length. A semibreve is four times the length of a crotchet.
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The dot next to a note increases its length by half of its original length. For example, the dotted half note. The dot increases the half note's length by half of its original length (which is 2 quarter beats) so the dotted half note is worth 3 quarter beats. It also works on rests. This also applies to other instruments.
A call note is the note naturally used by a male bird in call to a female - sometimes also used by birdwatchers to try and trick birds into appearing.
The duration of a minim is as twice as it of a crotchet.
The sound of the half note depends on which note is being played. A half note represents length, not tone.
It is called duration.
The Americans call it the half note and the English call it a semi-breve.
The length of sound, or of a musical note, is called its duration.
They call it a Quaer.