A class is having their picture taken. The photographer positions himself 21 feet from the center of the row of students. When the photographer looks at the last student at either end of the row, the photographer must tum 45° from center in either direction, as shown in the diagram.
21 feet
459
Photographer
Which is the best estimate of the length of the row of students?
21 feet
O 24 feet
30 feet
42 feet