Area of an equilateral triangle of side ‘a’ units can be calculated by using the formula:
$square root of straight s squared left parenthesis straight s minus straight a right parenthesis squared end root$
$left parenthesis s minus a right parenthesis square root of straight s squared left parenthesis straight s minus straight a end root$
$square root of straight s left parenthesis straight s minus straight a right parenthesis squared end root$
$left parenthesis s minus a right parenthesis square root of s left parenthesis s minus a right parenthesis end root$

Solution

left parenthesis s minus a right parenthesis square root of s left parenthesis s minus a right parenthesis end root

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