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Home > CCA2 > Chapter 7 > Lesson 7.2.3 > Problem 7-146

7-146.

Colleen and Jolleen both used their calculators to find sin 30°. Colleen got sin 30° = –0.9880316241, but Jollen got sin 30° = 0.5. Is one of their calculators broken, or is something else going on? Why did they get different answers? Homework Help ✎

Try calculating sin(30°) in both degree mode and radian mode on your calculator.