The circumcenter is also center of the triangles circumcircle. i'm not 100% but if this is one of your answers then i hoped this helped!
Hi, to find the total surface area you need to first find the area of each face. In the end it will equal 906. Hope this helps and sorry if it is confusing.
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Maybe if you give a better quality photo that isn't sideways! :D
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B is the answer, 5,400 is the interest
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sorry im late but the answer is C. 20.6
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