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= (18×10) + 4. (L sisi tegak)
=180 + 4 L sisi tegak
4 L sisi =180 : 4 = 45
L sisi = 45 cm
tinggi segitiga2= 13
luas permukaan limas=luas persegi+(2.luas segitiga1)+(2.luas segitiga2)
=(18.10)+(2.((10.15)/2)+(2.((18.13)/2)
=180+150+234
=564