What is the relative size,location, thickness and shape, of the left and right ventricles and atrium's?

My lab teacher wont tell me!!! Can someone help? I am a freshman and i just dissected a sheep's heart (whiich was so cool) but i have to fill out a lab sheet and my techer didnt explain anything!!!!!!!! also if u guys can tell me what the approximate diameter of the aorta is. Also what do you notice about the thickness of the aorta? And what is the advantage to the coronary artery originating from the left rather than the right side of the heart? thank you so much guys