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Show ALL work and \begin{tabular}{|l} **\#1.) Which angle is not coterminal with \( 130^{\circ} \) ? \\ a) \( -590^{\circ} \) \\ b) \( -230^{\circ} \) \\ c) \( -130^{\circ} \) \\ d) \( 490^{\circ} \)\end{tabular}

Ask by Bowman Salinas. in the United States
Mar 20,2025

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Answer

The angle that is not coterminal with \(130^\circ\) is \(-130^\circ\).

Solution

**Step 1.** Two angles are coterminal if they differ by a multiple of \(360^\circ\). That is, angles \(\theta\) and \(\theta + 360k\) (where \(k\) is an integer) are coterminal. **Step 2.** Check each option: - **Option a: \(-590^\circ\)** Add \(720^\circ\) (i.e., \(2 \times 360^\circ\)) to \(-590^\circ\): \[ -590^\circ + 720^\circ = 130^\circ \] So, \(-590^\circ\) is coterminal with \(130^\circ\). - **Option b: \(-230^\circ\)** Add \(360^\circ\) to \(-230^\circ\): \[ -230^\circ + 360^\circ = 130^\circ \] So, \(-230^\circ\) is coterminal with \(130^\circ\). - **Option c: \(-130^\circ\)** Add \(360^\circ\) to \(-130^\circ\): \[ -130^\circ + 360^\circ = 230^\circ \] Since \(230^\circ \ne 130^\circ\), \(-130^\circ\) is not coterminal with \(130^\circ\). - **Option d: \(490^\circ\)** Subtract \(360^\circ\) from \(490^\circ\): \[ 490^\circ - 360^\circ = 130^\circ \] So, \(490^\circ\) is coterminal with \(130^\circ\). **Conclusion:** The angle that is not coterminal with \(130^\circ\) is \(-130^\circ\).

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To determine which angle is not coterminal with \( 130^{\circ} \), we need to check the angles given in the options by adding or subtracting multiples of \( 360^{\circ} \). Coterminal angles differ by full rotations of \( 360^{\circ} \). To find a coterminal angle, the formula we can use is: \[ \text{Coterminal Angle} = \text{Given Angle} + n \times 360^{\circ}, \quad n \text{ is an integer} \] Now, we will evaluate the options: 1. **\( -590^{\circ} \):** \[ -590^{\circ} + 2 \times 360^{\circ} = -590^{\circ} + 720^{\circ} = 130^{\circ} \quad (\text{coterminal}) \] 2. **\( -230^{\circ} \):** \[ -230^{\circ} + 1 \times 360^{\circ} = -230^{\circ} + 360^{\circ} = 130^{\circ} \quad (\text{coterminal}) \] 3. **\( -130^{\circ} \):** \[ -130^{\circ} + 1 \times 360^{\circ} = -130^{\circ} + 360^{\circ} = 230^{\circ} \quad (\text{not coterminal with } 130^{\circ}) \] 4. **\( 490^{\circ} \):** \[ 490^{\circ} - 1 \times 360^{\circ} = 490^{\circ} - 360^{\circ} = 130^{\circ} \quad (\text{coterminal}) \] After evaluating all options, we find that \( -130^{\circ} \) is **not** coterminal with \( 130^{\circ} \). Thus, the answer is \( \text{c) } -130^{\circ} \).

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