tolong bantu jawab:)

keliling = 56 cm
s1 = x
s2 = 3x + 3
s3 = 4x - 3

keliling = x + 3x+3 + 4x-3
56 cm = 8x
x = 56 : 8
x = 7

s1 = x = 7
s2 = 3x + 3 = 3(7) + 3= 21 + 3 = 24 cm
s3 = 4x - 3 = 4(7) - 3 = 25

luas = 1/2 x 7 x 24
       = 7 x 12
       = 84 cm²