anonymous
  • anonymous
A person is watching a boat from the top of a lighthouse. The boat is approaching the lighthouse directly. When first noticed the angle of depression to the boat is 16° 23'. When the boat stops, the angle of depression is 49° 29'. The lighthouse is 200 feet tall. How far did the boat travel from when it was first noticed until it stopped? Round to the nearest hundredth.
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
@Jack1
Jack1
  • Jack1
|dw:1439343553024:dw|
Jack1
  • Jack1
|dw:1439343608565:dw|

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Jack1
  • Jack1
|dw:1439343722329:dw| so solve for x then solve for y then answer (how far did the boat travel) = y - x
Jack1
  • Jack1
u ok with how to do that from here @PHUNISH ?
anonymous
  • anonymous
but isn't there some formula use for this or do you just do it that way?
Jack1
  • Jack1
yep, but from here its just triangulation... as it's 2 right angled triangles if u look at it the right way so i'd use the Sine Rule for these ones (see attached)
1 Attachment
anonymous
  • anonymous
ohh okay thanks again I have like 3 or 4 more lol sorry but thanks for the explanation!
Jack1
  • Jack1
nah wait hang on: easier to use SOH CAH TOA for these (right angled, my bad - duh-moment)
Jack1
  • Jack1
sine (o) = opposite / hypotenuse... etc
anonymous
  • anonymous
okay thats what I thought haha

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