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AF² = 8 × 4 -> (BF = BE + EF)
AF² = 32
AF = 4√2 cm
Selanjutnya, dengan teorema Pythagoras, maka panjang AC =
AC² = FC² + AF²
= 16 + 32
= 48
AC = 4√3
Perhatikan bahwa ΔBDE sebangun dengan ΔBAC, sehingga:
DE/AC = BE/BC
AC × BE = DE × BC
4√3 × 2 = DE × 12
(4√3)/6 = DE
(2√3)/3 = DE
Panjang DE = (2√3)/3 cm (D)