Answer:
Step-by-step explanation: The square in the corner of the triangle represents a 90 degree angle, so you subtract both 90 and 35 to get 55 degrees, and that's all you have to do get the third angle. As for the line measurements, from B to C, all you have to do is use a ruler to measure it!! 2 is a leg of the triangle, so is the question mark both are supposed to be multiplied to get the hypotenuse, which is the third line and also the longest line out of the triangle.