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All the angles of a 9sided polygon are equal. a). calculate one outer angle. b). calculate one inner angle. c). write the sum of all inner angles. |
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Answer» a) 40°b) 1260°c) 140°Step-by-step EXPLANATION:a) sum of all INTERIOR angle = n-2×180/n = 9-2×180/9 = 7×20 = 140°b) Sum of EXTERIOR angle = 180-140 (LINEAR pair) = 40°c) Sum of interior angle = n-2×180 = 9-2×180 = 7×180 = 1260° |
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