Line hg is the perpendicular bisector of segment jk

Bisection, in Geometry, it refers to the division of a segment in two equal parts. A perpendicular bisector would be a segment that divides in two equal part and it intercepts with a right triangle.

So, in this case, if HG is the perpendicular bisector of segment JK, it means those segments are perpendicular, that is, there's a right angle between them.

Additionally, HG divides JK equally, in two segments, which are JG and GK, assuming that the interception points is at G.

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