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2 methods: A: Exterior angles of polygon always add to 360 deg. In this case exterior angle = 180 -171 = 9 deg, so there are 360/9 ie 40 sides. B: Interior angles of an n-sided polygon always add up to (2n -4) right angles ie 90 x (2n - 4) deg so in this case 180n - 360 = 171n ie 9n = 360 so n = 40.

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