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Answer :

Mhanifago

Answer:

  • 75 cm

Step-by-step explanation:

According to segment addition postulate we have:

  • AC = AB + BC

We are given:

  • AB = 5 BC

Then substitute values into the first equation:

  • AC = 5 BC + BC
  • 90 = 6 BC
  • BC = 90/6 = 15 cm

Find the length of AB:

  • AB = 5*15 cm = 75 cm

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