3 emaths pls..

• Fireindahouse

  5 Oct 07, 23:02

  Qn1.
  
  
  Help me with part c.pls
  
  Qn2.
  
  
  Qn3.
  
  
  got the picture in the best resolution i can
  pls help//
  
• eagle

  5 Oct 07, 23:04

  Originally posted by Fireindahouse:

  Qn1.
  
  
  Help me with part c.pls
  

  ABC = BCD = 156
  Total = 360
  
  BAD + ADC = 360 -156 - 156 = 48
  
  ADC = BAD cuz regular
  ADC = 24 degrees
• eagle

  5 Oct 07, 23:05

  Originally posted by Fireindahouse:

  Qn2.
  
  

  180 (n-2) = 160n
  
  20n = 360
  n = 18 sides
• Fireindahouse

  5 Oct 07, 23:08

  Originally posted by eagle:

  180 (n-2) = 160n
  
  20n = 360
  n = 18 sides

  oh yes i got this , the prob with me is with the part ii..
• eagle

  5 Oct 07, 23:10

  Originally posted by Fireindahouse:

  Qn3.
  
  

  3d trigo
  i)
  find CN by pygathoras = sqrt (60² + 100²)
  
  tan BCN = BN / CN
  then can find using calculator
  
  ii)
  BN / DB = sin 10
  so DB = BN / sin 10
  
  AB = 104 (given)
  
  So
  cos DBA = AB / DB
  then can find using calculator
• eagle

  5 Oct 07, 23:13

  Originally posted by Fireindahouse:

  oh yes i got this , the prob with me is with the part ii..

  x = 160 - 90 = 70 degrees
  
  CD = CM (square)
  CD = CB (regular polygon)
  hence CB = CM
  CBM = isos tri
  
  so angle CBM = 55 degrees
  y = 160 - 55 = 105 degrees
  
  Next time state which part you can do first + provide answers for those parts because some questions may need answers from those parts
• Fireindahouse

  5 Oct 07, 23:22

  wow the answers came too fast. Lol, Its GrEeat!
  
  many thks! let me digest it..