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1.
Diagonal of a square
d=a2d=a\sqrt{2}
2.
Circumscribed radius of a square
R=d2R=\dfrac{d}{2}
3.
Circumscribed radius of a square
R=a22R=\dfrac{a\sqrt{2}}{2}
4.
Incircle radius of a square
r=a2r=\dfrac{a}{2}
5.
Perimeter of a square
P=4aP=4a
6.
Area of a square
A=a2A = a^2