Hello can you please answer and explain :

Two sources emit microwaves of wavelength = 2.7 cm in phase. How far apart must they be for the first and the second constructive interference fringe on the same side of the central peak to be separated by an angle of 8 degrees?

Questions :

How far apart must the slits be from each other so that the first and second constructive interference bangs on the same side of the central peak are separated by an angle of 8 degrees?