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geo = a , (a+b) , 2a +2b
a(2a+2b) = (a+b)²
2a² + 2ab = a²+2ab+b²
a² = b²
a= b
a1= a
a3 = a + 2b = a+2= 3a
a1 / a3 = a/3a = 1/3