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a
a
a
a
2
=
d
2
/2
a
=
P / 4
a
2
=
A
d
d
o
d
d
2
=
2·a
2
d
2
=
P
2
/8
d
2
=
2· A
P
P
P
P
=
4 ·a
P
2
=
8· d
2
P
2
=
16· A
A
A
A
A
=
a
2
A
=
d
2
/2
A
=
P
2
/16
Square: Surface area, side, diameter, perimeter
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