Răspuns :
a. paralelogram, dreptunghi, patrat, romb
b.,c. AB≡CD, AD≡BC, AO≡OC, BO≡OD
MN≡PQ, MQ≡NP, NR≡RQ, MR≡RP
CD≡DE≡EF≡FC, CG≡GE≡DG≡GF
HI≡IJ≡JL≡LH, LT≡TI, HT≡TJ
d. diagonale
b.,c. AB≡CD, AD≡BC, AO≡OC, BO≡OD
MN≡PQ, MQ≡NP, NR≡RQ, MR≡RP
CD≡DE≡EF≡FC, CG≡GE≡DG≡GF
HI≡IJ≡JL≡LH, LT≡TI, HT≡TJ
d. diagonale