Jawab ya.. Pakai cara point nya banyak lhoo

a) tinggi balok = 24 : 4 : 3
                       = 2 cm tinggi balok

     Luas permukaan balok = 2 x ((pxl) + (pxt) + (lxt))
                                           = 2 x ((4x3) + (4x2) + (2x3))
                                           = 2 x 26
                                           = 52 cm²

b) tinggi balok = 315 : 9 : 7
                       = 5 cm tinggi balok b

Luas permukaan balok = 2 x ((pxl) + (pxt) + (lxt))
                                     = 2 x ((9x7) + (9x5) + (7x5))
                                     = 2 x 143
                                     = 286 cm²