doodleymooc
doodleymooc doodleymooc
  • 16-05-2018
  • Mathematics
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what is X in (3x-12)° on question number 7?

what is X in 3x12 on question number 7 class=

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sqdancefan
sqdancefan sqdancefan
  • 23-05-2018
The exterior angle is equal to the sum of the opposite interior angles.
   (4x+9) = (2x) + (3x-12)
   4x + 9 = 5x - 12 . . . . . . . . collect terms
   21 = x . . . . . . . . . . . . . . . .add 12-4x

Then the exterior angle is
   (4·21+9)° = 93°
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