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1.In an equilateral ∆ABC, AD is the altitude on the side BC. ADF is also an equilateral ∆. Find the ratio of the areas of ∆ADF and ∆ABC. 2.In any equilateral ∆ABC, AD is the altitude on the side BC and AE is the median on the same side. Find the ratio of AD and AE. 3.The sum of the ages of father and his son is 63 years.9 years ago, the father was 3 times the present age of his son.find the present ages.
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