Image locations url

i posted this on Wordpress but it's still unresolved



I "Filezilla'd" an image to /public_html/wp-admin/images

I have tried to display the image on a page using various URLs and it never appears.
Latest attempt is this:
<img src=/public_html/images/ciancakes.jpg" />

I have tried this format advised in another post:
<img src="http://www.yourdomainname.com/images/imagename.jpg">

I even tried the absolute URL.

None work - what am I doing wrong?
(Something embarrassingly simple I bet)