Question

⦟11 and ⦟12 are congruent, or supplementary?

Answer 1

They are supplementary since if you get rid of the line between the angles you will have a 180 degree line. When two angles equal 180 degrees then they are supplementary

Answer 2

∠11 and ∠12 are supplementary.

Explanation:

Let's look at angles 12 and 11..

We can see that they both share a same side and vertex, thus that makes them adjacent.

We can also infer that these two angles form to make a straight angle, meaning they both equal to 180 degrees when added together.

A supplementary angle are two angles that have a sum of 180 degrees either adjacent or not which form to make a straight angle. From our previous observations, we can say that these two angles are supplementary as they fulfill the requirement of totaling to 180 degrees if added together as they form to make a straight angle.

Therefore, ∠11 and ∠12 are supplementary.