For a circle, A=[tex] \pi [/tex] [tex] r^{2} [/tex] For this circle the radius is 18mm so when we plug it in we get A=[tex] \pi (18)^{2} [/tex] [tex] 18^{2} = 324 [/tex] so now we have A=324[tex] \pi [/tex] Using 3.14 as [tex] \pi [/tex] We now have A=(3.14)(324) which is equal to 1017.36 So we know that A=1017.36 [tex] mm^{2} [/tex]
