C. State the Postulate or Theorem that justifies each of the following.
1. If S is in the interior of , then  =  + 
2. If  and  are vertical angles, then  ≅ .
3. If  and  are right angle, then  ≅ 
4. If  and  form a linear pair, then they are supplementary.
5. If ∆, ̅
̅̅̅ ≅ ̅
̅̅̅̅
, then  ≅ .
D. Draw and label an illustration for each geometric term being identified.
1. A line p containing C and R
2. A plane Q containing points M and E
3. Three collinear points A, I and R
4. A ray PC
5. Line s perpendicular to line t