Thread: trig 2
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Old January 12th, 2009, 02:37 AM
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earboth earboth is offline
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Originally Posted by william View Post
1.A ship sees a lighthouse which is found to be 9.8 km distant through the use of radar. The lighthouse is 3km from a second lighthouse. The angle between the line of sight between the two lighthouses is 30°. What is the angle between the line of sight between the ship and lighthouse 2, when looking from lighthouse 1?

2.In a triangle ABC, side a is 18cm long, side b is 10cm long and angle B is 89°. What is the measure of angle A?
With the values given in both questions you can't construct a triangle and therefore you can't calculate any additional values. (Conflict with congruence rule SSA)

I've attached the construction for #1.
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trig-2-nolighthhouse.png  
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