No 22 help me pleaseee

GC = √(FC²-FG²) = √(15²-12²) = √81 = 9 cm
DC = AB = DG + GC = 15 + 9 = 24 cm
L bangun = L cdef + L abcd = ½(15+24)×12 + 24×8 = 234 + 192 = 426 cm² (B)