Question

The measure of one of the equal angles in an isoscles trinagle is twice the measure of the remaining angle. Determine the exact radian measures of the three angles in the triange
let the 'remaining' angle of the triangle be x radians
then each of the other angles is 2x radians

2x + 2x + x = pi radians
x = pi/5 radians

then the "exact" measures of the three angles are
pi/5, 2pi/5 and 2pi/5

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