Variables

a
→
Side of a square
d
→
Diagonal
R
→
Circumscribed circle radius
r
→
Inscribed circle radius
P
→
Perimeter
A
→
Area
1.
Diagonal of a square
$d=a\sqrt{2}$
Diagonal
Square
2.
Circumscribed radius of a square
$R=\dfrac{d}{2}$
Circumcircle R
Square
3.
Circumscribed radius of a square
$R=\dfrac{a\sqrt{2}}{2}$
Circumcircle R
Square
4.
Incircle radius of a square
$r=\dfrac{a}{2}$
Incircle r
Square
5.
Perimeter of a square
$P=4a$
Perimeter
Square
6.
Area of a square
$A = a^2$
Area
Square

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