Obtuse Triangle
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Orthocenter of a triangle
Circumcenter
Its technical name is the incenter; it's also the center of the largest circle that can be inscribed within the triangle. (It is also equidistant from the nearest point along each of the three sides, if that's not obvious.)
yes, three planes can intersect in one point.
This is true. If three straight lines are drawn, they can only intersect at two points. That is, each line will only intersect with another once.