Hi Marcy,

Since you are asking for square metres I expect that you want the area of the circle. The area of a circle is given by

area = π r²

where r is the radius and π is approximately 3.1416. The radius is half the diameter so you have a radius of 12/2 = 6 cm. You want square metres not square centimeters so you need to convert the radius to metres. There are 100 centimeters in a metre so 6 cm = 6/100 = 0.06 m. Thus the area of your circle is

π r² = 3.1416 × 0.06² = 0.0113 m²

Penny