Question

when a polyhedron be called a regular polygon​

Answer 1

Polyhedrons have vertices, edges, and faces which to Euclid had dimensions of zero, one, and two respectively. If a polyhedron has faces which are regular and congruent polygons -- all of them -- and if at each vertex exactly the same number of faces meet, then we have a"regular" polyhedron.

Answer 2

Step-by-step explanation:

ᴘᴏʟʏʜᴇᴅʀᴏɴꜱ ʜᴀᴠᴇ ᴠᴇʀᴛɪᴄᴇꜱ, ᴇᴅɢᴇꜱ, ᴀɴᴅ ꜰᴀᴄᴇꜱ ᴡʜɪᴄʜ ᴛᴏ ᴇᴜᴄʟɪᴅ ʜᴀᴅ ᴅɪᴍᴇɴꜱɪᴏɴꜱ ᴏꜰ ᴢᴇʀᴏ, ᴏɴᴇ, ᴀɴᴅ ᴛᴡᴏ ʀᴇꜱᴘᴇᴄᴛɪᴠᴇʟʏ. ɪꜰ ᴀ ᴘᴏʟʏʜᴇᴅʀᴏɴ ʜᴀꜱ ꜰᴀᴄᴇꜱ ᴡʜɪᴄʜ ᴀʀᴇ ʀᴇɢᴜʟᴀʀ ᴀɴᴅ ᴄᴏɴɢʀᴜᴇɴᴛ ᴘᴏʟʏɢᴏɴꜱ -- ᴀʟʟ ᴏꜰ ᴛʜᴇᴍ -- ᴀɴᴅ ɪꜰ ᴀᴛ ᴇᴀᴄʜ ᴠᴇʀᴛᴇx ᴇxᴀᴄᴛʟʏ ᴛʜᴇ ꜱᴀᴍᴇ ɴᴜᴍʙᴇʀ ᴏꜰ ꜰᴀᴄᴇꜱ ᴍᴇᴇᴛ, ᴛʜᴇɴ ᴡᴇ ʜᴀᴠᴇ ᴀ"ʀᴇɢᴜʟᴀʀ" ᴘᴏʟʏʜᴇᴅʀᴏɴ.