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Precizati daca, in urmatoarele cazuri, patrulaterul MNPQ (MP ∩ NQ={O}) este dreptunghi:
a) MNPQ paralelogram si m(∡N)=90°
b) [MN]≡[QP], MQ║ NP, m(∡M)=90°
c) ∡M ≡ ∡N≡∡P≡∡Q
d)MN║PQ si ∡MQP≡∡MNP
e) MQ║NP, [MQ]≡[NP], [MP]≡[NQ]
f) OM=ON=OP=OQ= 5cm, m(∡Q) =90°

Răspuns :

Danamocanu71
a. MNPQ paralelogram si m(<N)=90 adevarat;
b. [MN]≡[QP] ,MQ║NP ,m(<M)=90 adevarat;
c. <M≡<N≡<P≡<Q adevarat;
d. MN║PQ si <MQP≡MNP adevarat;
e. MQ║NP ,[MQ]≡[NP] ,[MP]≡[NQ] adevarat;
f. OM=ON=OP=OQ=5cm ,m(<Q)=90 fals;

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