Its not a triangle if it has only two sides.
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There is only one basic shape for an equilateral triangle. The area can only vary as the length of the sides vary.
add the sides toghther and then you'll have your perimeter of your triangle
It is possible depending on what type of triangle it is. For instance if it was an equilateral triangle then all sides would be equal and then by means of Pythagoras' theorem you could work out the height of the triangle and using the formula: 1/2*base*height = area
A triangle can have only three sides. No triangle can have 9 sides!
you can't