tolong dijawab ya..... soal nomor 63. dan soal nomor 64.

nomer 63
Luas permukaan balok
= 2(pl+pt+lt)
= 2((12x8) + (12x5) + (8x5))
= 2(96+60+40)
= 2(196)
= 392 cm^2
jawaban C

nomer 64
Luas permukaan kubus
= 6 x s^2
= 6 x 12 x 12
= 864 cm^2
jawaban B

lp balok = 2 x p x l = 2 x 12 x 8 = 192
= 2 x p x t = 2 x 12 x 5 = 120
= 2 x l x t = 2 x 8 x 5 = 80
= 192 + 120 + 80 = 392 (C)
lp kubus = 6 x s x s
= 6 x 12 x 12
864 (B)