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AB = BD yaitu 17 cm
AC = DF yaitu 15 cm
karena segitiga siku-siku maka dengan teorema phytagoras, cari panjang BF
BF = √(BC² - DF²)
= √(17² - 15²)
= √(289 - 225)
= √64
= 8
AF = AB - BF
= 17 cm - 8 cm
= 9 cm (B)
semoga bermanfaat ^^