It seems that the only change you have made is to omit are before also.
You must leave it in.
I would improve the start of the sentence thus:
'The line segment, bar and pie charts are not only used. . . .'
Tip for a better title: The bar, line segment, and the pie -charts.
Please take the trouble to write Thanks in full (actually, you don't need to write it here at all; just click on the Like button when you get an answer you find useful).
- For Teachers