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An isosceles triangle is in effect two right angled triangles joined together and in this case they have bases of 5 units and heights of 2 units so use Pythagoras' theorem to find the hypotenuse which will be the length of one of the equal legs of the isosceles triangle:-

52+22 = 29 and the square of this is about 5.385164807 or 5.385 to 3 dp

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