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The Brainliest Answer!
2014-08-25T19:37:53+05:30
Formula of interior angle of a regular n sided polygon = 180(n-2)/n
for 12 sided polygon put n = 12
each interior angle = 180*10/12 = 150
interior angle + external angle = 180
each external angle = 180 - 150 = 30
2 5 2