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Question

In triangle A B C comma D element of stack B C with bar on top blank a n d blank fraction numerator A B over denominator A C end fraction equals fraction numerator B D over denominator D C end fraction. blank I f blank angle B equals 70 to the power of ring operator end exponent blank a n d blank angle C equals 50 to the power of ring operator end exponent blank t h e n blank angle B A D equals

  1. 30º    
  2. 60º    
  3. 90º    
  4. 15º    

The correct answer is: 30º

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