## anonymous one year ago Question in the picture

The formula for the area of a circle is $\large Area=\pi r^{2}$ The area of circle B is $\large A _{b}=\pi \times15^{2}\ cm^{2}$ The area of circle A is $\large A _{a}=\pi \times5^{2}\ cm^{2}$ The ratio of area of circle B to the area of circle A is therefore given by $\large \frac{A _{b}}{A _{a}}=you\ can\ calculate$