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= 1/2 x 18
= 9
tinggi segitiga tegaknya
Luas permukaan kubus tampa alas dan tutup
Lp = 4 x s²
= 4 x 18 x 18
= 1296 cm²
luas limas
Lp = La + ( 4 x a x t)
= 324 + ( 4x9x12)
= 324 + 432
= 756 cm²
jawabannya 756 cm²