Hello again, just got a few questions pertaining to circles. I'll just post one to start with;

"The radius of the earth is approximately 6371 km. If the international space station (ISS) is orbiting 353 km above the earth, find the distance from the ISS to the horizon (x).

So solving this.. according to the segments of secants and tangents theorem...

x^{2}= (2r + 353)(353)

x^{2}= (12742 + 353)(353)

x^{2}= 4622535

x = $\displaystyle $\sqrt{4622535}$$ = 2150km (approx.)

Did I do that right?