Multiply the diameter by (pi), or the radius by (2 pi).
If you have a drawing of the circle, and the center is marked, you can measure
the radius and the diameter. Just lay your ruler across the circle, and make sure
that it touches the center.
If the center isn't marked, then it won't be that easy.
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congruent, convex, cirlce, circumfrence
Multiply pi by the diameter.
Surface Area r2x 3.14159(pi)x 2 + (why times 2, well theres 2 circles) Circumfrence X Hieght Area of cirlce + Area of Rectangle around = Surface area
Area of a circle = pi*radius2
The circumference of a circle is (diameter) multiplied by (pi).