Пусть a - основание равнобедренного треугольника, b - боковая сторона, тогда b/a = 4/3, т.е. b = (4/3)*a, P = a+ b + b = 66 см, a+ (4/3)*a + (4/3)*a = 66, a*( 1 + (4/3)+(4/3) ) = 66, a*(3+4+4)/3 = 66, a*11/3 = 66, a = 66*(3/11) = 6*3 = 18 см, b = (4/3)*a = (4/3)*18 = 4*6 = 24 см.
b/a = 4/3,
т.е. b = (4/3)*a,
P = a+ b + b = 66 см,
a+ (4/3)*a + (4/3)*a = 66,
a*( 1 + (4/3)+(4/3) ) = 66,
a*(3+4+4)/3 = 66,
a*11/3 = 66,
a = 66*(3/11) = 6*3 = 18 см,
b = (4/3)*a = (4/3)*18 = 4*6 = 24 см.