# Airplane

Aviator sees part of the earth's surface with an area of 200,000 square kilometers. How high he flies?

Correct result:

h =  4.995 km

#### Solution:

$R=6378 \ \text{km} \ \\ S=200000 \ \text{km}^2 \ \\ \ \\ S=2 \pi R v \ \\ v=S / (2 \pi \cdot \ R)=200000 / (2 \cdot \ 3.1416 \cdot \ 6378) \doteq 4.9907 \ \text{km} \ \\ y=R - v=6378 - 4.9907 \doteq 6373.0093 \ \text{km} \ \\ x=\sqrt{ R^2-y^2 }=\sqrt{ 6378^2-6373.0093^2 } \doteq 252.2639 \ \text{km} \ \\ k=\cotan \alpha=x/y=(h+v)/x \ \\ x/y=(h+v)/x \ \\ h+v=x^2/y \ \\ h=x^2/y - v=252.2639^2/6373.0093 - 4.9907=4.995 \ \text{km}$

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