That depends on what you know about the triangle. The easiest way to calculate the area is to calculate (1/2) x base x height, where the base is any side, and the height is perpendicular to the base. Other formulae exist for special cases, for example, for the case that you only know the length of the three sides.
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only solids have "lateral area". triangles have "area". the area of a scalene triangle is given by heron's formula. height not needed.
They need not be. You can have a right scalene triangle.
a ramp is a scalene triangle
Use the distance formula to calculate the distances between the three vertices. If they are all different, the triangle is scalene, if only two are the same, the triangle is isosceles, and if they are all the same, the triangle is equilateral.
A scalene triangle has no equal sides.