Help me with this question please for 20 points

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

Pls brainliest will be awarded if answer is correct

Your company will replace the asphalt roofs on all the buildings at the factory complex shown below. the buildings have flat roofs. you charge according to the total roof area. what is this area, in square yards?