Jawaban:

Mencari tinggi segitiga

begin mathsize 14px style straight t equals square root of 8 squared minus 4 squared end root straight t equals square root of 64 minus 16 end root straight t equals square root of 48 straight t equals square root of 16 cross times 3 end root straight t equals 4 square root of 3 end style

Menghitung Luas segitiga

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell straight L increment end cell equals cell 1 half cross times straight a cross times straight t end cell row blank equals cell 1 half cross times 8 cross times 4 square root of 3 end cell row blank equals cell 4 cross times 4 square root of 3 end cell row blank equals cell 16 square root of 3 end cell end table end style

LUAS PERMUKAAN

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row straight L equals cell 4 cross times straight L increment end cell row blank equals cell 4 cross times 16 square root of 3 end cell row blank equals cell 64 square root of 3 end cell row blank blank blank end table end style

Jadi luas permukaan limas tersebut adalah begin mathsize 14px style bold 64 square root of bold 3 bold space bold cm to the power of bold 2 end style