Petunjuk H.54.1.

Langkah 1. Jika \(B_{d_E}(p,r)\subseteq O\text{,}\) gunakan \(B_{d_T}(p,r)\subseteq B_{d_E}(p,r)\text{.}\)

Langkah 2. Jika \(B_{d_T}(p,r)\subseteq O\text{,}\) gunakan \(B_{d_E}(p,r/\sqrt2)\subseteq B_{d_T}(p,r)\text{.}\)