anonymous
  • anonymous
Help? Picture attached!
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
anonymous
  • anonymous
anonymous
  • anonymous
AD subtends an angle of 30 at the center, right? Not at O?
anonymous
  • anonymous
I'm weak in geometry :(

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anonymous
  • anonymous
I am too, that's why I'm here haha.
Callisto
  • Callisto
Would you mind marking the angle clearly? i can't identify which 30 and which is 20... :(
anonymous
  • anonymous
AD= 30, and angle A is 20
Callisto
  • Callisto
Is that all info you have ? and what is m the question mentioned?
anonymous
  • anonymous
I'm not sure what's it's asking, and that's all of the information :/
hoblos
  • hoblos
well what i can help with is: arc(ADCB) = 180° arc(AD) =30° arc(BC) = 2*20 = 40° so arc(DC) = 180-(30+40) = 110° now you have arc(DC) and there must be a formula to calculate angle(DOC)
hoblos
  • hoblos
i found the formula of interior angles :D m(DOC) = [arc(AB)+arc(DC)]/2= [180+110]/2 =145°
anonymous
  • anonymous
|dw:1333269481416:dw|
hoblos
  • hoblos
oh yeah! i think this is an easier way!! my bad.. i always think in the harder way..
anonymous
  • anonymous
i think everyone was... me too! :)

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