



 
Hi Danica, I can help get you started. In my diagram the large cone has radius $r$ and height $h$ and the top part of the cone has radius $r_1$ and height $h_{1}.$ Your task is to determine the fraction $f = \large \frac{h_1}{h}.$ The triangles $ABC$ and $DBE$ are similar so \[\frac{r_1}{r} = \frac{h_1}{h} = f.\] Write back if you need more assistance, 



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