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PLease help this my last question

PLease help this my last question-example-1
User Sudharsun
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1 Answer

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Answer:

  • y = 15
  • ∠abc = 68°
  • ∠bac = 78°
  • ∠acb = 34°

Explanation:

It is helpful to realize that the exterior angle is equal to the sum of the remote interior angles:

146° = (5y+3)° +(4y+8)°

135 = 9y . . . . . . . . . . . . . . divide by °, subtract 11

15 = y . . . . . . . . . divide by 9

∠abc = (4y+8)° = (4·15 +8)° = 68°

∠bac = (5y+3)° = (5·15 +3)° = 78°

∠acb = 180° -146° = 34°

User Taz Ryder
by
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