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luas permukaan balok tanpa tutup
= (pxl) + 2(pxt) +2(lxt)
= (8x8) +2(8x11) + 2(8x11)
= 64 + 176 +176
= 416
luas selimut limas
= 4(1/2 ( alas x tinggi segitiga selimut)
= 4 ( 1/2 ( 8 x 5)
= 4 ( 20)
=80
luas permukaan selubuh bangun tersebut = 416+80 = 496 cm² (C)