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The 'G' clef is the treble clef, it is called that because the 'spiral' of the treble clef lies on the G line (second line from bottom). The bass clef is called the 'F' clef because it looks kind of like this ): and the line between those two dots in the middle (second line from top), is the 'F' line.
The line of action of a force F expresses the geometry of how F is applied. It is the line through the point at which F is applied and along the direction in which F is applied.
Corresponding angles (also called F angles) are ang les that are the same on parallel lines (lines at the same angle next to each other) with a bisecting angle (a line that cuts through the parallel line). The lines look like a capital F and the corners of the "F" are the corresponding angles and they are the same.
I don't understand exactly which F you mean - but from one F to the next it is one octave.
f(x) = x2 This is a function by the vertical line test because a vertical line drawn through this function will only intersect the function at one point