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Home > A2C > Chapter 8 > Lesson 8.1.5 > Problem 8-80

8-80.

Colleen and Jolleen both used their calculators to find sin 30°. Colleen got sin 30° = −0.9880316241, but Jolleen 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 ✎
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Try calculating sin(30°) in both degree mode and radian mode on your calculator.