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AP calculus

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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 -

    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 ±0.5° indicates a height error of

    dh = 115*2.525*0.5*π/180 = ±2.53m which agrees quite nicely with the explicit values found above

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