Clue: A regular one has internal angles of 140 degrees

Answer: NONAGON

Length: 7

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Similar Clues:

• Its internal angles total 1,260 degrees (NONAGON with 7 letters)
• A regular one's angles are each 135 degrees (OCTAGON with 7 letters)
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• Its internal angles total 720 degrees (HEXAGON with 7 letters)
• Like angles less than 90 degrees (ACUTE with 5 letters)
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• Having all angles equal to 144 degrees (DECAGONAL with 9 letters)