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OpenStudy (anonymous):
In regular pentagon ABCDE, diagonal AC is drawn as shown. Given that each interior angle of a pentagon measures 108 degrees what is the measure of angle CAB?
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OpenStudy (danjs):
|dw:1441155020989:dw|
OpenStudy (danjs):
bad drawing, but regular means all sides are the same length, so AB = BC, since ABC is an isocelese triangle, the two angles opposite AB and BC are the same
OpenStudy (danjs):
|dw:1441155154987:dw|
OpenStudy (danjs):
Angle B is given as 108 angles u and v are the same measure the total of u, v and 108 is 180 for the 3 angles of a triangle
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