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the two guy wires supporting a tower form an isosceles triangle with the ground. each of the base angles of the triangle is 4 times the third angle. find the measure of the vertex angle



Answer :

internal measure of a triangle is 180 degrees
base angles of an isosceles triangle are =
therefore each base angle is 4x
4x+4x+x=180
9x= 180
  x=20
vertex angle= 20




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