Barbara H. answered 02/16/15
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Enthusiastic mathematics teacher and World Record Swim Coach
Area = side x side A = 6 x 6 = 36 square centimeters A = 9 x 9 = 81 square centimeters
Ratio = 36 / 81 (divide numerator and denominator by 9) = 4 / 9 (answer to 1.)
I'm not sure what a golden rectangle is. However, when you find out, the formula will probably be
a^2 + b^2 = c^2 a^2 + b^2 = 12^2