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Statistics

Question

Area of an isosceles triangle with equal sides a and third side b is =
$straight b over 4 square root of 4 a squared minus b squared end root$
$straight b over 2 square root of 4 straight a squared minus straight b squared end root$
$b square root of 4 straight a squared minus straight b squared end root$
$straight b over 3 square root of 4 straight a squared minus straight b squared end root$

Solution

straight b over 4 square root of 4 a squared minus b squared end root