R_2=3\quad cm\\S=\pi R^2\\S_1=\pi(6^2)=36\pi=36\cdot3,14\approx113,04\\ S_2=\pi(3)^2=9\pi=9\cdot3,14=28,26" alt="R=\frac12d\\R_1=6\quad cm\\
R_2=3\quad cm\\S=\pi R^2\\S_1=\pi(6^2)=36\pi=36\cdot3,14\approx113,04\\ S_2=\pi(3)^2=9\pi=9\cdot3,14=28,26" align="absmiddle" class="latex-formula">