Answer:
centroid- the point of concurrency of the <em>medians.</em>
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orthocenter- the point of concurrency of the <em>altitudes.</em>
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circumcenter- the point of concurrency of the <em>perpendicular bisectors.</em>
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hope this helps :)
The remaining co-ords are (1,2) and (5,4).
I=2,400×0.07
I=168
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