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1296 = ⅓ × s² × 12
1296 = 4 × s²
324 = s²
s = √324 = 18 (panjang rusuk)
Lp = La + Luas jmlh sisi tgak
(18 × 18) + ({!
Maka panjang rusuk alasnya=√108=6√3 cm
Luas limas=luas alasx2+luas selimutx4=(6√3 x 6√3) x2 +(6√3x12)x4=216+288√3
=216+499=715 cm²
Jadi luas alasnya 715 cm²