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a = 1/2 x 30
= 15
tinggi sisi tegak
LΔ = a x t
= 15 x 31
= 465
luas permukaan
Lp = La + 4 LΔ
= 30 x 30 + 4 x 465
= 900 + 1860
= 2760 cm²
jawabannya 2760 cm²