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OpenStudy (anonymous):
Find the measure of angle B?
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OpenStudy (anonymous):
jimthompson5910 (jim_thompson5910):
this polygon has 7 sides
jimthompson5910 (jim_thompson5910):
so n = 7
jimthompson5910 (jim_thompson5910):
S = 180(n-2) S = 180(7-2) S = 180*5 S= 900 So the angles all ad up to 900 degrees
jimthompson5910 (jim_thompson5910):
So... A + B + C + D + E + F + G = 900 (12x-9)+(9x+14)+(133)+(10x+9)+(10x)+(136)+(10x+5) = 900 solve for x, then use this to find B = 9x+14
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