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alas = √5^2 - 4^2
= √25 - 16
= √9
= 3 cm
rusuk alas = 2 x 3 = 6 cm
Panjang rusuk alasnya adalah 6 cm
Luas segitiga = 1/2 x alas x tinggi
= 1/2 x 6 x 4
= 12 cm2
Luas 4 segitiga = 4 x 12 = 48 cm2
Luas alas = 6 x 6 = 36 cm2
Luas permukaan limas = luas alas + luas segitiga
= 36 + 48
= 84 cm2