If angle upper A upper F upper B approximately equals angle upper D upper F upper E, what must be true?

Statement: if two distinct planes intersect, then their intersection is a line. which geometry term does the statement represent? defined term postulate theorem undefined term

What is the measure of the smallest angle in the diagram? 15 29 32 45

Which part of a 2-column proof is the hypothesis of the conjecture? a) given b) reasons c) prove d) statements ! i think it's b but i'm not quite