Refer to the figure above. The lines from each vertex (corner) of the triangle and is perpendicular to the opposite side are the triangle’s height or altitude. The point where all three lines … 展开

This figure illustrates the incenter of a triangle: The lines from each of the triangle’s vertex to the opposite side are the triangle’s angle bisectors. The biggest circle that can fit inside the … 展开

This figure illustrates the circumcenter of a triangle: The lines from each of the triangle’s midpoint to the opposite side are the triangle’s perpendicular bisectors. The circle that passes through all the vertices of the triangle is the circumcircle. The center of the circumcircle … 展开

It is always inside the triangle. It is always equidistant from the sides of the triangle. The incenter of a triangle is also the center of its incircle. 展开