Nope they are never similar, just like snowflakes.
35/4
16/9
The volume is proportional to the cube of the height.
The ratio of their heights is 9:4
sometimes
No. You need to have the same vertex angle, or have the same ratio between the height and radius of the cones in order to have similar cones.
0.9
35/4
Not always, sometimes two obtuse triangles are similar and sometimes they are not similar.
15/7 APEX
16/9
The volume is proportional to the cube of the height.
729:1
well seed cones are very similar to pine cones they both haves seeds and pine needles... you cant see the needles cause theyre tiny.
The ratio of their heights is 9:4
sometimes
Two equilateral triangles are always similar!