Can you please help me and explain how to do both of these problems, I don't understand

I’m pretty sure for the second one you have to subtract 34 from 180 because all the angles in a triangle equal to 180. We know that the two angles are the same because of the hash marks. So 180-34= 146. Then, divide 146 by two because there are two equal angles left: 146/2=73. And that’s your answer. Oh also a tip: remember that those angles are acute which means they are less that 90 degrees