book Maths Puzzle Numerical Ability

What are the 3 different formulas to finding the area of a triangle? I also need the name to the corresponding formulas. Thankyou

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book Other Question

If the length of a wall is 48"in and the lenght of a picture is 26"in. What is the center of the two linear equation. Does this have a solution? If not why? If so why?
24x + 10y = 4000
5y = -12x + 8000