Which could cause a satellite to descend low enough that it burns up in earth's atmosphere

Orbit decay could cause a satellite to descend low enough to burn up.

Ithink true dkfkfkfkdkkdkdkdkddkdk

Distance^2= yellow line ^2 (see picture) = 30^2 + 49^2so distance = squareroot of (300^2 +49^2)i dont know if this is how to solve it, but i cnt think of another way