\begin{definition}[Definition:Right Circular Cone/Similar Cones]
Let $h_1$ and $h_2$ be the lengths of the axes of two right circular cones.
Let $d_1$ and $d_2$ be the lengths of the diameters of the bases of the two right circular cones.
Then the two right circular cones are '''similar''' {{iff}}:
:$\dfrac {h_1} {h_2} = \dfrac {d_1} {d_2}$
{{EuclidSaid}}
:''{{Definition:Euclid's Definitions - Book XI/24 - Similar Cones and Cylinders}}''
{{EuclidDefRefNocat|XI|24|Similar Cones and Cylinders}}
Category:Definitions/Cones
\end{definition}