问题1：以下哪些附图位于相同的基础上并且在相同的相似点之间?在这种情况下，请写出公共底线和两个平行线。
解决方案：
(i) Since, ABCD is a Trapezium and ΔPDC lie on the same base of Trapezium i.e DC and ΔPDC lie in-between the same parallel lines AB and DC.
(ii) Since, Parallelogram PQRS and trapezium SMNR lie on the same base SR but not in-between the same parallel lines.
(iii) Since, Parallelogram PQRS and ΔRTQ lie on the same base QR and ΔRTQ lie in-between the same parallel lines QR and PS.
(iv) Since, Parallelogram ABCD and ΔPQR do not lie on the same base but ΔPQR lie in-between the same parallel lines BC and AD.
(v) Since, Quadrilateral ABQD and trapezium APCD lie on the same base AD and in-between the same parallel lines AD and BQ.
(vi) Since, Parallelogram PQRS and parallelogram ABCD do not lie on the same base SR but parallelogram ABCD in-between the same parallel lines SR and PQ.
