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2. Luas permukaan limas segitiga sama sisi =
1/4 s^2 akar 3 + luas segitiga tegak
Tinggi segitiga tegak = akar 6^2 - 3^2
Akar 36-9= akar 27 = 3akar3
Maka luas permukaan = 1/4 6^2.akar3+1/2.6.3akar3
1/4.36.akar3+3.3akar3
9akar3+9akar3 = 18akar3