Lines, Angles, and Triangles

SAT Math· difficulty 4/5

The sum of the interior angles of a polygon is 1620°1620°. How many sides does it have?

  • A

    99

  • B

    1212

  • C

    1010

  • D

    1111

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Explanation

180(n2)=1620180(n-2)=1620, so n2=9n-2=9 and n=11n=11.

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