In the sentence i told lisa the office secretary that i would be late what’s the subject in this sentence?

find the verb in the sentence, so for instance in this sentence it would be told, then ask who or what told? the answer to that is the subject. so who are what told? I (the subject) told. the subject is I

right angles are formed by perpendicular lines. if the lines would extend, to make two intersecting lines, they would form four right angles.

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