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Diameter 18mm what is the area

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JannieRoseShinviz
area= (3.14 x 18mm) x 2
Jasenviz
area of circle=[tex] \pi r^2[/tex] 
and r=2d
r=(18)2
 =36
area of the circle = [tex] \pi r^2[/tex] 
the answer is 1296[tex] \pi [/tex]mm^2