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a. 2 x (P x L)
b. 2 x (P x T)
c. 2 x (L x T)
maka luas permukaan = a + b + c
jadi penyelesaiannya:
a. 2 x (40 x 16) = 2 x 640 = 1280
b. 2 x (40 x 15) = 2 x 600 = 1200
c. 2 x (16 x 15) = 2 x 240 = 480
L.permukaan = 1280 + 1200 + 480 = 2960
mohon maaf bila ada kesalahan