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The angles of a 15 –sided polygon are in arithmetic sequence. Which of those given below is an angle of this polygon? (1) 128° (2) 130° (3) 132° (4) 156° |
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Answer» (4) 156° 15/2 (2a + 14d) = 180 x 13 ⇒ a + 7d = 156 |
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