jika panjang cd = de = 12 cm maka panjang ab =

jawab

AB = AE + EF + FB
AE² = √AD² - DE²
AE² = √13² - 12²
AE² = √169 - 144
AE² = √25
AE = 5 cm

EF = CD = 12 cm

FB² = √BC² - CF²
FB² = √15² - 12²
FB² = √225 - 144
FB² = √81
FB = 9 cm

maka,
AB = 5 cm + 12 cm + 9 cm
AB = 26 cm

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