A kit is 120m high and 130 m of string is out. If the kite is moving away horizontally at the rate of 52 m/sec, find the rate at which the string is being paid out.

Explanation

With the given details, we can draw a triangle.

Please refer to video to see the traingle.

Here, `AB` is the vertical height at which kite is flying and `AK` is the string.
`AB = 120m and AK = 130m`.
`K` is the point where kite is at present.

Traingle `APK` is aright angle triangle,

`:. BK = sqrt (130^2-120^2) = 50m`.

Now, we can create an equation using pythagoras theorem.

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