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Verified answer
Kalau tidak salah ..AD = √CD x √BD
AD = √4 x √5
AD = √20 cm
Semoga membantu ..
panjang BC = 9 cm
panjang CD = 4 cm
ditanya :
panjang AD = ...?
jawab :
pertama mencari panjang BD
BD = BC - CD
BD = 9 cm - 4 cm
BD = 5 cm
kedua mencari panjang AD dengan perbandingan
AD / CD = BD / AD
AD / 4 = 5 / AD
AD x AD = 5 x 4
AD² = 20
AD = √20 cm
semoga membantu