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= luas alas + 2.L∆arah panjang + 2.L∆arah lebar
tinggi tegak arah panjang
=√12^2 +5^2
= √169
= 13
tinggi tegak arah lebar
=√12^2 + 9^2
=√225
= 15
luas permukaan
= (18.10) +(2.1/2.18.13) +(2.1/2.10. 15)
= 564