An accidental chord is a chord which contains one or more notes which are considered foreign to the key in which the song is written.
An example might be to include an E flat major chord in a song played in C major.
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The longest chord of a circle is its diameter
the chord is 4in long
yes
. . the chord.
You cannot. If you rotate the circle around its centre, the lengths of the radius and chord will remain the same but the coordinates of the chord will change.