+26400 If the radius of a circle is 4cm, what is that area ?
$$\mathrm{Radius} \quad r = 4\ cm \qquad \mathrm{Area}_{Circle}\quad A =\ ?$$
$$\boxed{ A = \pi \cdot {r^2} }$$
$$A = \pi \cdot 4^2 \ cm^2\\
A = \pi \cdot 16\ cm^2 \\
A = 3.14159265359 \cdot 16\ cm^2 \\
A = 50.2654824574 \ cm^2 \\
A \approx 50.27 \ cm^2$$
+26400 If the radius of a circle is 4cm, what is that area ?
$$\mathrm{Radius} \quad r = 4\ cm \qquad \mathrm{Area}_{Circle}\quad A =\ ?$$
$$\boxed{ A = \pi \cdot {r^2} }$$
$$A = \pi \cdot 4^2 \ cm^2\\
A = \pi \cdot 16\ cm^2 \\
A = 3.14159265359 \cdot 16\ cm^2 \\
A = 50.2654824574 \ cm^2 \\
A \approx 50.27 \ cm^2$$
