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Panjang sisinya =√1628=41cm
Luas persegi CDEF= 81cm
Panjang sisinya =√81=9cm
Maka didapat :
Sisi miring=41cm
Panjang alas=9cm
Tinggi=√(41)²-(9)²=√1600=40cm
Luas CFI= 1/2 .Alas.Tinggi
Luas CFI=1/2.(9).(40)
Luas CFI= 180cm² (Jawaban D)