From the center
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The circumcenter also called incenter. Whichever one you like the best out of these 2.* * * * *Not true!It is the incentre. The circumcentre is where the perpendicular bisectors of the sides meet.Using the incentre as centre, you can draw a circle to which all three sides of the triangle are tangents. The circle is the biggest circle that will fit IN the triangle.Using the circumcentre as centre, you can draw a circle which passes through all three vertices of the triangle. The circle is the smallest circle that will contain (circumscribe) the triangle.
rectangle
The circumcenter of the triangle.
If I understand your question correctly, you would need to subtract the area of the inscribed circle from the circumscribed circle. Which would approximately be 78.60cm squared.
To circumscribed a circle about a triangle you use the angle. This is to get the right measurements.