exam Maths Puzzle Numerical Ability

hi, i was having some problem with a question, i would like to know a formula that can find the area of a scalene triangle if i only know its perimeter.please help me.

thanks.

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exam Other Question

I have worked this problem several times and I have had someone else look too, and we are not finiding the same answer. I am thinking we hace did soethign wrong. Can you please hel L has y-intercept (0, 2) and is perpendicular to the line with equation 2x - 3y = 6.
Write the equation of the line L satisfying the given geometric conditions.