Question very unclear to me, so here is my try
1) r = 9.4
s= 13.1
Using cosine law:
t = sqrt( 9.4² + 13.1² + 2(9.4)(13.1)cos(31.7) ) = 7.1
Using Heron's formula
semi-perimeter, sp = (r+s+t)/2 = 14.8
Area = sqrt(sp(sp-r)(sp-s)(sp-t) = 32.344 sq units
2) k = 17.7
l = 18.3
Using cosine law:
m = sqrt( 17.7² + 18.3² + 2(17.7)(18.3)cos(62.5) ) = 18.68
Using Heron's formula
semi-perimeter, sp = (17.7+18.3+18.68)/2 = 27.19
Area = sqrt(sp(sp-k)(sp-l)(sp-m) = 141.91 sq units
3) p = 7.4, s= 9.3, l = 14.5
semi-perimeter, sp = (7.4 +9.3 +14.5)/2 = 15.6
Area = sqrt(15.6(15.6-7.4)(15.6-9.3)(15.6-14.5)) = 29.774 sq units
4) x= 8.7, y = 11.6, k = 19.2
semi-perimeter = (8.7+11.6+19.2)/2 = 19.75
Area = sqrt(19.75(19.75-8.7)(19.75-11.6)(19.75-19.2)) = 31.277 sq units