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sarah110128 Group Title

prove that a+ b= y for the angles given in the figure.

  • one year ago
  • one year ago

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  1. sarah110128 Group Title
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    |dw:1358143521967:dw|

    • one year ago
  2. sarah110128 Group Title
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    side ab, bc, cd, de are equal

    • one year ago
  3. matricked Group Title
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    is the triangle a rt-angled one at D

    • one year ago
  4. sarah110128 Group Title
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    Yes

    • one year ago
  5. Compassionate Group Title
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    Gut abreit!

    • one year ago
  6. matricked Group Title
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    let DE= ab=bc= cd=x tany =1 tana=DE/DA =1/3and tanb=DE/DB=1/2 now tan(a+b) =(1/3 +1/2)/( 1- (1/3)(1/2))= (1/2+1/3)/(1-1/6) =(5/6)/(5/6)=1 thus tan(a+b)=1 but tany=1 hence tan(a+b)=tany thus a+b=y

    • one year ago
  7. matricked Group Title
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    hope it helps u

    • one year ago
  8. personperson99 Group Title
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    could have just exterior angles

    • one year ago
  9. sarah110128 Group Title
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    Thank Youu! It was helpful :)

    • one year ago
  10. matricked Group Title
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    the other way to solve is to complete the rectangle with sides as AD and DE and draw the inner squares and then use elementary geometrical properties

    • one year ago
  11. matricked Group Title
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    welcome dear

    • one year ago
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