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= 10
tinggi sisi tegak
luas segitiga tgak
LΔ = a x t
= 10 x 24
= 240
luas pemukaan limas
Lp = La + 4 x LΔ
= 20² + 4 x 240
= 400 + 960
= 1360 cm²
jawabannya 1360 cm²