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The angles can be any size, as long as they add up to 10800, since (n-2)*180 = (8-2)*180 = 6*180 = 1080o. So some of them could be acute, right angles, obtuse, or even reflex. e.g. 30o+50o+90o+100o+150o+170o+220o+ 270o= 1080o However, if the octagon is a regular octagon (all sides equal), then each of the 8 angles will be 1080/8 = 135o, so they are all obtuse.

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Q: How many obtuse angles are in a octagon?
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