Show that SolutionWe use the property two intersecting lines

Solution

We use the property:

two intersecting lines form pairs of congruent angles, called vertical angles.

OR to put it in other words:

When two lines intersect they form two pairs of oppositeangles, A + C and B + D. Another word for opposite anglesare vertical angles. Vertical angles are always congruent, which means that they are equal. Adjacent angles areangles that come out of the same vertex.

So, 2 and 5 are vertical angles. and hence are congruent.