Since this is a 30-60-90 triangle, if the side against the 30 degree angle is equal to 2 the one against the 60 degree angle must be equal to
and the side against the 90 degree angle must be equal to 4. (I will upload a picture, these are rules for right angles)
Total=28
fantail (f)=comets (c)-4
comets=c
Fantails + comets =28
c-4 +c=28
2c-4=28
2c-4+4=28+4
2c=32
2/2c=32/2
c=16