Jawabanmu

2014-04-25T15:31:39+07:00

L.Permukaan = 2 x luas alas + (keliling alas) x t

= 2 x  \frac{8.10}{2} + (8+7+7) x 8

= 40 + (22 x 8)
= 40 + 176
= 216 cm²

2014-04-25T15:36:32+07:00
Luas permukaan = 2.Luas alas + Luas sisi tegak
= 2 . 1/2 . 8 . 10 + 8.8 + 8.7 + 8.10
= 80 + 64 + 56 + 80
= 280