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= (s * s) + 4 (a * t / 2)
= (12 * 12) + 4 (12 * 10 / 2)
= 144 + 4 * 60
= 144 + 240
Lp. Limas Persegi = 384 cm²
t sisi tegak limas = 10
Lp limas = La + (4 x luas sisi tegak)
= 12 x 12 + (4 x 12 x 10/20
= 144 + 240
= 384 cm'pangkat 2