With regards to the area of a circle it is: pi*1.5*1.5 square meters
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I assume you mean a circle. Divide the diameter by 2, to get the radius. Then use the standard formula for the area of a circle (pi x radius squared).
3 * pi meters
Area of a triangle = 0.5*base*height. In this case, area = 0.5*3*5 = 7.5 metre2.
7.0686 square feet for a 3-foot diameter circle.
Area = pi*7.52 = 176.715 square cm rounded to 3 dp
3 square metres