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V limas persegi = La . tb : 3
48.000 = s² . tb : 3
48.000 = 60² . tb : 3
48.000 = 3.600 . tb ; 3
48. 000 = 1.200 . tb
48.000 : 1.200 = tb
tb = 40 cm
b ) t segitiga = ?
Phytagoras = c = √ a² + b² = √40² + 30² = √ 1600 + 900 = √2500 = 50 cm
note : saat mencari t segitiga, b nya adalah 30. 30 didapat dari 60 : 2 = 30 cm.