SOLUTION: the measure of each of the congruent angles of an isosceles triangle is 9 degrees less than 4 times the vertex angle. find the measure of each angle of the triangle

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let x="vertex angle"

"the measure of each of the congruent angles of an isosceles triangle is 9 degrees less than 4 times the vertex angle"
___ 4x-9

2(4x-9)+x=180 ___ 8x-18+x=180 ___ 9x=172