Which undefined terms are needed to define parallel lines?

Find the coordinates of a if b(-9,-10) is the midpoint of ac and c has the coordinates of (-1,9)

Hey this is extremely !international aid debate for geography 10 will mark de brainliest! questions are down below plz put an answer and evidence for it. q1: what are the problems with international aid? q2: what are the alternatives to international aid? q3: what do you think is the best approach to offer international aid? ( answer these questions with credible answers and evidence)

What causes heat transfer in fluids