Factorise, check by using multiplication a-7a+12​

Will give are given that xy is parallel to zw. if xz is a transversal that intercepts xy and zw, angle angle alternate interior angles. since xy is parallel to zw, we know that these angles are we also know that angle xvy and angle zvw are , and thus congruent. we can conclude that △xyv ~ △zwv using the similarity theorem.

Consider the proof. given: segment ab is parallel to line de. prove: what is the missing statement in step 5?

What is the missing step in this proof ?