[CLUE-Tech] making use of unused disk space

[Jason Friedman]

                            cfdisk 2.10s

                        Disk Drive: /dev/hda
                      Size: 20020396032 bytes
        Heads: 255   Sectors per Track: 63   Cylinders: 2434

   Name      Flags    Part Type FS Type       [Label]      Size (MB)
 ------------------------------------------------------------------
   hda1      Boot      Primary  Linux ext2    [/boot]          41.13
   hda5                Logical  Linux ext2    [/usr]         3150.29
   hda6                Logical  Linux ext2    [/home]        3150.29
   hda7                Logical  Linux ext2    [/var]         3150.29
   hda8                Logical  Linux ext2    [/opt]         3150.29
   hda9                Logical  Linux ext2    [/]            3150.29
   hda10               Logical  Linux ext2    [/tmp]         1052.84
   hda11               Logical  Linux swap                    271.44
                       Logical  Free Space                   2903.53

Above is the output from cfdisk.
It shows I have 2.9GB of free space on my disk.
I want to allocate some of that to an existing partition.
How do I do that?