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Mathematics 9 Online
OpenStudy (anonymous):

Identify the sum of the interior angle measures of a convex dodecagon.

OpenStudy (mathmate):

|dw:1406646574398:dw| Add up the interior angles of the 10 triangles, then subtract the angles at the centre (360) that do not count for the interior angles of the dodecagon.

OpenStudy (anonymous):

thx

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