.If a line is drawn parallel to one side of a triangle to intersect the other two sides in distinct points, prove , in a right angled triangle the square of hypotenuse is equal to the sum of the squares of the other two sides., the ratio of the areas of two similar triangles is equal to the ratio of square of their , If ∆ABC is an equilateral triangle such that ADBC,then AD²=……….., A man goes 150m due east and then 200m due north. How far is he from the starting point?, If in two triangles, corresponding angles are equal, then the two triangles are…………….

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