Quantum redactiones paginae "Circulus" differant

Content deleted Content added
constat in => constat ex; puntis => punctis; inserted ab
inserted interioris: the circle itself has no area (being a one-dimensional set of points)
Linea 12:
:: <math>c = 2\pi \cdot r</math>
 
Area A interioris circuli computatur a formula:
 
:: <math>A = \pi \cdot r^2.</math>