where lines cross over at a common point
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ᴡʜᴇɴ ᴛᴡᴏ ᴏʀ ᴍᴏʀᴇ ʟɪɴᴇꜱ ᴄʀᴏꜱꜱ ᴇᴀᴄʜ ᴏᴛʜᴇʀ ɪɴ ᴀ ᴩʟᴀɴᴇ, ᴛʜᴇy ᴀʀᴇ ᴄᴀʟʟᴇᴅ ɪɴᴛᴇʀꜱᴇᴄᴛɪɴɢ ʟɪɴᴇꜱ. ᴛʜᴇ ɪɴᴛᴇʀꜱᴇᴄᴛɪɴɢ ʟɪɴᴇꜱ ꜱʜᴀʀᴇ ᴀ ᴄᴏᴍᴍᴏɴ ᴩᴏɪɴᴛ, ᴡʜɪᴄʜ ᴇxɪꜱᴛꜱ ᴏɴ ᴀʟʟ ᴛʜᴇ ɪɴᴛᴇʀꜱᴇᴄᴛɪɴɢ ʟɪɴᴇꜱ, ᴀɴᴅ ɪꜱ ᴄᴀʟʟᴇᴅ ᴛʜᴇ ᴩᴏɪɴᴛ ᴏꜰ ɪɴᴛᴇʀꜱᴇᴄᴛɪᴏɴ. ʜᴇʀᴇ, ʟɪɴᴇꜱ ᴩ ᴀɴᴅ q ɪɴᴛᴇʀꜱᴇᴄᴛ ᴀᴛ ᴩᴏɪɴᴛ ᴏ, ᴡʜɪᴄʜ ɪꜱ ᴛʜᴇ ᴩᴏɪɴᴛ ᴏꜰ ɪɴᴛᴇʀꜱᴇᴄᴛɪᴏɴ.
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