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Draw lines a little futher than the original lines and you will notice that there is an angles on a straight line question. Measure with a protractor or if not drawn to scale divide 360 by 9. if answering on a straight line then make sure it adds up to 180 degrees. With the 360 divided by 9, the bigger angle should be the interiorangle and the smaller the exterior. The exterior angles should all add up to 360 degrees!

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11y ago
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Q: How do you work out the exterior angles of a nine sided shape?
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