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Theproblemsolver
Theproblemsolver Theproblemsolver
  • 15-05-2016
  • Mathematics
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penfila11Pen
penfila11Pen penfila11Pen
  • 15-05-2016

∠D = 90°
∠E = x
∠F = 2x - 12


Angles in a triangle = 180°
  90 + x + 2x - 12 = 180
  78 + 3x = 180
 -78            -78
   3x = 102

  \(\frac{3x}{3} = \frac{102}{3}\)
  3 and 3 cancels out
  
  34 = x

∠E = 34°

∠F = 2x -12
      = 2 × 34 - 12
      = 56°




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