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Panjang rusuk alas = 10 x 4 = 40 cm
sisi miring Δ = 12² + 5² = 144 + 25
= √169 = 13 cm
Panjang rusuk sisi tegak limas = 13 x 4 = 52 cm
Jadi panjang rusuk seluruhnya = 40 + 52 = 92 cm
Maaf kalau ada kesalahan