SOLUTION: the measure of a base angle of an isosceles triangle is 4 times the measure of the vertex angle. what is the number of degrees in the vertex angle?

Question 522903: the measure of a base angle of an isosceles triangle is 4 times the measure of the vertex angle. what is the number of degrees in the vertex angle?
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
the measure of a base angle of an isosceles triangle is 4 times the measure of the vertex angle. what is the number of degrees in the vertex angle?
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Let vertex angle be "x".
Each base angle is "4x".
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Equation:
x + 4x + 4x = 180 degrees
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9x = 180
x = 20 degrees (vertex angle)
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Cheers,
Stan H.
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