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= 2(L.trapesium) + L.persegi panjang
= 2((16+10) x 8 x 1/2) + {(20 x 10) + (20 x 16) + (20 x 8) + (20 x 10)}
= 208 + (200 + 320 + 160 + 200)
= 208 + 880
= 1.088 cm²
b. Volume
= L.alas x t
= ((16 + 10) x 8 x 1/2) x 20
= 104 x 20
= 2.080 cm³
c. panjang kerangka
= 4(20) + 2(10) + 2(10) + 2(8) + 2(16)
= 80 + 20 + 20 + 16 + 32
= 120 + 48
= 168 cm