Use SOH CAH TOA
Sin(61)=x/7
X=sin(61)(7)
X=6.12
6.12^2+b^2=7^2
32.48+b^2=49
B=16.5
Sin(66.7)=8/x
Sin(66.7)x=8
X=8/sin(66.7)
X=8.7
A^2+8^2=8.71^2
A^2+64=75.86
A^2=11.86
A=3.4
To get the perimeter you just add all of the side lengths together, hope this helped:))
(Please correct me if you see any errors)