Pătratul
ABCD pătrat
O
OB=
AC=8cm
cm
ABCD pătrat
PABCD =
AB = 9 cm
cm
ABCD pătrat
N
M
MN =
BD = 12 cmM- mijlocul lui BCN-mijlocul lui AB
cm
ABCD pătrat
A ABCD =
PABCD = 56 cm 
cm2
ABCD pătrat
PABCD =

AABCD = 144 cm2

cm
ABCD pătrat
 BAC =
o
ABCD pătrat
O
 AOB=
o
ABCD pătrat
ΔDEC,ΔCBF echilaterale
∠DEA=
∠CEF=
∠AEF=
o
o
o
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