上線のない AB は長さを表し、the length of segment AB（the length of AB とも）と読む。
根拠の件数
話し言葉計 25
the length of segment …14
the length of a b | the length of ab | the length of b c | the length of bc | the length of a c | the length of ac | the length of c d | the length of cd | the length of a d | the length of ad | the length of b d | the length of bd | the length of d c | the length of dc | the length of e a | the length of ea | the length of o p | the length of op | the length of j l | the length of jl | the length of k l | the length of kl11