Homework Help: AP calculus

Posted by Layka on Thursday, December 27, 2012 at 11:28am.

The base of the Great Pyramid at Giza is a square that is 230 m on each side.

1.Find the height of the pyramid, knowing that when a person is standing at the center of its side he measures the angle of elevation of the apex to be 51 degrees with an error of +/- 0.5 degrees.

2. Build the model of the Great Pyramid at Giza using calculations from #1.

3. Use differentials to estimate the allowable error in the elevation angle that will ensure an error in the height is at most +/- 5m.

AP calculus - Steve, Thursday, December 27, 2012 at 11:58am
1. h = 115 tan51° = 142 m
with error, 139.51 <= h <= 144.57

2. sorry, you'll have to do that yourself!

3.
h = 115 tanθ
dh = 115 sec^2 θ dθ
5 = 115 * 2.525 dθ
dθ = .01722 = 0.986°

just as a check, our error of ą0.5° indicates a height error of

dh = 115*2.525*0.5*π/180 = ą2.53m which agrees quite nicely with the explicit values found above

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