Question

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line jl and line km intersect at point h. find the three unknown angle measures in the figure.
what do you notice about the angles
on opposite sides of point h?
they are supplementary.
they have the same measure.

Explanation:

When two lines intersect, vertical angles (angles on opposite sides of the intersection point) are congruent (have the same measure). In the given figure, the pairs of vertical angles are \(51^{\circ}\) and \(51^{\circ}\), \(129^{\circ}\) and \(129^{\circ}\).

Answer:

They have the same measure.