
Find the distance he is now from Vista, and the angle he has to turn to fly directly there.

Answer to Problem 5P
The distance he is now from Vista is about 232.1 km, and the angle he has to turn to fly directly there is about 76.3° .
Explanation of Solution
Given:
J is flying a plane from Midville to Vista , a distance of 500 km. Because of a thunderstorm , he had to fly 17.5° off course for 300 km.
Formula Used:
Law of Cosine :
a2=b2+c2−2bccosA
Law of Sine:
asinA=bsinB=csinC
Calculation:
Represent the situation :
We need to find measure of angle A and b.
Use Law of Cosine:
b2=a2+c2−2accosB⇒b2=3002+5002−2(300)(500)cos17.5°⇒b2=340000−300000cos17.5°⇒b≈232.1
Use Law of Sine:
sinA500=sin17.5°232.1⇒sinA=500⋅sin17.5°232.1.................[multiply each side by 500]⇒A≈40.4°⇒A=180°−48°−55.7°=76.3°
So, the distance he is now from Vista is about 232.1 km, and the angle he has to turn to fly directly there is about 76.3° .
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