some cafeteria trays are shaped like isosceles trapezoid so they will fit around the tables. if the measures of one pair of base angles of the tray or 120° what are the measures of the pair of base angles

Dis the answer you perception is how you see the world 

Historians are researchers of the past or people who understand the history of people. with this field, they must possess qualities such as being unbiased, patient, efficient reader, has a knack for logic and critical thinking and reasoning, disciplined, open-minded, resourceful, with good analytical ability, good reasoning skills and problem solving!