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You can use the rectangular-polar conversion on any scientific calculator to do this type of conversion. However, in this case, you should be able to do the calculation in your head: any point on the positive i-axis has an angle of 90 degrees; any point on the negative i-axis (as in this case) has an angle of 270 degrees.

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9y ago

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r = 5

theta = 3pi/2 or 270 deg.

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9y ago
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r = 5, theta = 1.5*pi

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9y ago
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Q: -5i find polar form of complex number?
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