(i) The term "They" denotes students from centuries ago.
(ii) In the context of 2157, "Regular" signifies what is typical, where a regular teacher refers to the mechanical teacher.
(iii) The mechanical teacher is being juxtaposed with human teachers from earlier periods.
(i) The kind of person the doctor is (money, possessions)
(ii) The kind of person he wants to be (appearance, ambition)
ABCD is a quadrilateral in which AD = BC and ∠ DAB = ∠ CBA (see Fig. 7.17). Prove that
(i) ∆ ABD ≅ ∆ BAC
(ii) BD = AC
(iii) ∠ ABD = ∠ BAC.
