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= 6r×r + 2PinTu + 2 PaLu + 2 TaLi
= 6r2. + 2pt + 2pl + 2tl
= 6× 4 × 4+ 2×10×2 + 2×10×8 + 2×2×8
= 24 × 4 + 2×20 + 2×80 + 2×16
= 96 + 40 + 160 + 32
= 328 cm2 yang C.
= 1/2 x 8cm
= 4cm
L pemukaan kubus = 5 x
= 5 X 16
= 80
(5 sisi karena 1 sisi lainnya melekat pada balok)
L permukaan balok = 2 ( 10cmx8cm + 10cmx2cm + 8cmx2cm)
= 2 ( 80 + 20 +
= 2 x 116
= 232
L permukaan seluruh bangun =
=
Jawabannya B.312