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Mathematics 7 Online
OpenStudy (help_people):

A ray is a defined term because it has no width or depth is described using an undefined term has an informal definition travels forever in one direction

OpenStudy (help_people):

not c or d or a so b ?

OpenStudy (alexandervonhumboldt2):

well @ganeshie8 explained `it can be described useing two other undefined terms :- point & line`

OpenStudy (help_people):

so b @AlexandervonHumboldt2 and if yes can u help with 2 more?

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