### Home > PC > Chapter 4 > Lesson 4.1.4 > Problem 4-54

4-54.

Roger is in an Algebra 2 class and has found the radian setting on his calculator. He has not learned about radians but would like to know.

Explain to Roger how a radian is defined.

1 radian is the angle measure found by wrapping one radius around a circle.

Show him how to change 240° to radians.

Use a Giant One of

. Show him how to change

radians to degrees.