(i) Triangle APB and trapezium ABCD are on the common base AB and between the same parallels AB and DC.
So,
Common base = AB
Parallel lines: AB and DC
(ii) Parallelograms ABCD and APQD are on the same base AD and between the same parallels AD and BQ.
Common base = AD
Parallel lines: AD and BQ
(iii) Consider, parallelogram ABCD and ΔPQR, **** between the same parallels AD and BC. But not sharing common base.
(iv) ΔQRT and parallelogram PQRS are on the same base QR and **** between same parallels QR and PS.
Common base = QR
Parallel lines: QR and PS
(v) Parallelograms PQRS and trapezium SMNR share common base SR, but not between the same parallels.
(vi) Parallelograms: PQRS, AQRD, BCQR are between the same parallels. Also,
Parallelograms: PQRS, BPSC, APSD are between the same parallels.
