It is called vertical.
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A pair of intersecting lines form adjacent and opposite angles. So the answer to the question is an opposite angle.
When lines intersect, angle formed between them is Θ or 180-Θ.
90 degrees.
Two pairs of vertical angle formed by intersecting lines is a plus sign or an x. something that looks like this, but with the lines completely touching: +x
Intersecting lines that form a right angle are perpendicular lines.