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4.10+4l+4.4=88
40+4l+16=88
4l=88-56
l=32/4
l=8
a)
Luas Permulaan balok
=2(pl+pt+lt)
=2(10.8+10.4+8.4)
=2(80+40+32)
=2(152)
=304 cm²
b).
Volume balok
=panjang x lebar x tinggi
=10 x 8 x 4
=320 cm³