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By adding the three sides.
The area of any triangle has the same formula, which is base times height, divided by 2. A scalene triangle is a triangle with three sides of unequal length, which is not important when calculating the area.
Use a ruler and measure one side only. All sides will measure the same if the triangle is equilateral.
When each of the 3 interior angles measure less than 90 degrees and the 3 sides are of different lengths
Using trigonometry. The Hypotenuse x The height