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1.
Circumscribed radius of equilateral triangle
$R=\dfrac{2h}{3}$
2.
Circumscribed radius of equilateral triangle
$R=\dfrac{a\sqrt{3}}{3}$
3.
Circumscribed radius of a square
$R=\dfrac{d}{2}$
4.
Circumscribed radius of a square
$R=\dfrac{a\sqrt{2}}{2}$
5.
Rectangle circumcircle radius
$R=\dfrac{d}{2}$
6.
Circumcircle radius
$R=\dfrac{c}{2}$