Once in wonderland the Key of Reality of building a house with the Key of Constructs. They made a blue print and in the blueprint it shows that Angle <4 and <3 are supplementary. This is because m<3 + m<4 = 180. They also are same side interior angles . They found this out by looking at the blueprint . The reason is because the definition of same side interior angles. This helped find out that side R and side S are parallel to each other . Now The Key of Reality and Key of Constructs are excited about their house they're going to build .