Answers:
a) [tex]\frac{A}{r}=2.5 \pi=7.85[/tex]
b) [tex]\frac{A}{r^{2}}=\pi=3.14[/tex]
Step-by-step explanation:
Assuming each grid has dimensions of 1x1, the radius of this circle is:
[tex]r=2.5[/tex]
On the other hand, the area of a circle is:
[tex]A=\pi r^{2}[/tex]
With this information we will solve this exercise:
a) [tex]\frac{A}{r}[/tex]
[tex]\frac{\pi r^{2}}{r}=\pi r[/tex]
[tex]\pi r=(3.14)(2.5)=7.85[/tex]
b) [tex]\frac{A}{r^{2}}[/tex]
[tex]\frac{\pi r^{2}}{r^{2}}=\pi=3.14[/tex]
