By similar triangles, $ \frac{r}{h} = \frac{4}{12} = \frac{1}{3} $, so $ r = \frac{h}{3} $.

February 22, 2026

$By similar triangles, $ \frac{r}{h} = \frac{4}{12} = \frac{1}{3} $, so $ r = \frac{h}{3} $.$

By similar triangles, \( \frac{r}{h} = \frac{4}{12} = \frac{1}{3} \), so \( r = \frac{h}{3} \).