Phase to Phase Voltage= 415 v
Line to Line Voltage =

in 3-phase sysytem 4 lines will be there. 

3 lines for R, Y, B. 1 line for neutral. So B/W R&B or B&Y 
etc is line to line voltage i.e 440V
b/w any one of R or Y or B nad neutral is phase voltage i.e 
230V

Voltage across any two line in a multiphase system is line 
voltage. where as voltage across a line and a neutral is 
phase voltage.

phase to phase voltage is 440v equal to line to line 
volatage

phase to phase voltage 415v equal to line to line voltage

R phase TO NEUTRAL =220V
Y Phase to neutral =220V
line to line voltage =440v

The same.

phase to phase and line to line voltage are same.

Consider the voltage in R-phase or line=230V
                        Y-phase or line=230V
                        B-phase or line=230V

To calulate phase to phase voltage you have a formulae i.e.,
inputvoltage*root3(1.732)i.e.,
230v*1.732=398.36v.

This is called as phase to phase or line to line voltage.

phase to phase voltage is 415.
lineto line voltage 11kv

phase voltage to phasevoltage is 1/1.732
line to line voltage is 1*1.732

phase to phase 440

line voltage 220

In case of star
Phase current= line current and Iph=Iline

Phase Voltage = Line voltage/1.732

In case of Delta

Phase current = Line current/1.732

Phase voltage = line voltage