absha1216
contestada

the measure of each base angle of an isosceles triangle is 15° less than the measure of the vertex angle. find the degree measure of the vertex angle

Respuesta :

bcalle
x + x - 15 + x - 15 = 180
3x - 30 = 180
3x = 210
x = 70
70 - 15 =  55
Vertex angle 70 degrees 
Each base angle 55 degrees
CHECK 55 + 55 + 70 = 180

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