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Easy

Question

In the figure, stack A B with bar on top text  and  end text stack A D with bar on top are tangents to circle. What is the value of m?

  1. 550
  2. 350
  3. 450
  4. 650

hintHint:

90o+90o +m +3m = 360o

The correct answer is: 450


    Sum of all interior angles of a quadrilateral is 360o
    90+90+m +3m = 360o 

    4mo=180o
    m=45o

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