Deletion of Right circular hollow cylinder

Comment: Wikipedia is , especially for so elementary a topic
Stance: delete
Cited policy: Wikipedia:What Wikipedia is not (WP:NOTTEXTBOOK)

Comment: is there any reason why this can't be merged with Cylinder (geometry) appearing under Cylinder (geometry)#Other types of cylinders|Other types of cylinders?, as for other "elementary topics" being separate, merge discussions can be started on their respective talkpages if editors think 
Stance: comment
Cited policy: Wikipedia:Arguments to avoid in deletion discussions (WP:OTHERSTUFF)