In geometry, a square is a regular quadrilateral, which means that it has four equal sides and four equal angles (90-degree angles, or (100-gradian angles or right angles).

Side of a square: a

Diagonal: d

Radius of circumscribed circle: R

Radius of inscribed circle: r

Perimeter: L

Area: S

- $d=a√2$
- $R=d/2={a√2}/2$
- $r=a/2$
- $L=4a$
- $S=a^2$

No Comments »