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A triangle ABC has base BC = 5 cm, angle B = 60° and AB - AC = 1 cm with AB > AC.
After the construction is complete you measure AB = 8 cm. What is the length of AC (in cm)?

Class 9Constructions of TrianglesGeometry
  • A8
  • B7
  • C9
  • D6

Step-by-Step Solution

AB - and AB = 8, so cm. (Check: cos 60° = 64 + 25 - 40 = 49, so )
Answer: B) 7

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