How do you determine how high a kite is flying?

1. Mark the string where you're holding it and pull the kite in.
2. Jerk the kite so that it falls directly to earth, or have someone walk out until they're directly under the kite. Measure this distance.
3. Apply the Pythogorean Theorem (a^2 + b^2 = c^2) as Length of string^2 - distance to kite/person^2 = height of kite^2. Thus:
[100 li of string^2 =] 10,000 - [50 li to person/kite^2 =] 2,500 = a kite height equal to the square root of 7,500 li, or about 86.6 li.

But I don't bother with such things; I just fly the kite and enjoy.