another math homework problem from trigonometric?

Question

problem "Find the minimum height (H) above the suface of the earth so the the pilot at point (A) in the figure can see an object in the horizon at (C), 125 miles away.
Note: Assume the the radius of the Earth is 400x10^3 miles."

Answer 1

where is the figure?

Answer 2

If you draw this, draw a circle of radius R. Draw a radius line straight up. Continue this line for a distance h above the circle (h is the pilot's altitude). Draw a line from the end of this segment tangent to the circle on the right. Draw a radius to this tangent point. This last radius line forms a right angle with the tangent line. The length of the tangent line from tangent point to the end of the extended vertical radius is the sight distance, s. You now have a right triangle whose two legs are R and s, and whose hypotenuse is (R+h). From the relation (R+h)^2 = R^2 + s^2, you can solve for h since you know R and s.

NOTE check the value for earth's radius. It really is 4*10^3 miles, not 400*10^3 miles.

Answer 3

What I keep in mind of Pre-calc (as I took it about 5 years in the past) develop into particularly elementary. in reality what we discovered develop into each and every thing from algebra and trig. All we did develop into take it a touch deeper and discovered diverse procedures of doing particular issues, like Gaussian eliminating and Cramer's Rule to sparkling up platforms of equations. even as you received't use this a lot in calc that's good for Linear Algebra. We also went into summation fairly fairly, that can help once you do skill sequence in calc, and we went so some distance as to work out limits and derivatives on the right of the twelve months. We did not do any proofs, yet were in simple terms presented to the standard theory of what one is and the thanks to compute them. you'll study limits and derivatives from the starting up in calc so there is not any element in doing it in pre-calc (i develop into so bored the first month or so of calculus). also, as you've suggested, you could %. up issues off the web in case you do not realize. So I say bypass pre-calc once you're college enables it. you receives each and every thing in calc that you would possibly want to are transforming into from that class, except possibly graphing applications without using derivatives. good luck!

Answer 4

Is there a picture along with the question that would show the location of all the points A, B and C ?

And no, this isn't a trigonometric question.