The two errors made are angle 90 was not indicated to be formed at the point of intersection of the bisector and also wrong indication of congruent segments.
The diagram has been fixed. See attachment below for the fixed diagram.
In order to understand the errors in the diagram, note the following:
A perpendicular bisector divides a line segment into two equal halves and also forms a right angle at the point of intersection.
Congruent segments are indicated by equal number of strokes. i.e. small straight lines to indicate congruency.
The TWO ERRORS:
1. There's no indication on the point of intersection that a right angle was formed on both sides of the segment bisected.
2. The equal segments are not well labelled or indicated. arEH and HJe indicated that they are equal using one stroke.
GH and HI is another set of congruent segments that should be indicated with different number of strokes to indicate only both of them are equal segments.
In summary, the two errors made are angle 90 was not indicated to be formed at the point of intersection of the bisector and also wrong indication of congruent segments.
The diagram has been fixed. See attachment below for the fixed diagram.
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