Suppose the three sides are x, y and z.
Let s = (x+y+z)/2
Then area = sqrt[s*(s-x)*(s-y)*(s-z)]
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scalene has 3 different length sides.
That is a scalene triangle.
You spell ' equaiateral;, correct;y as 'equilateral'. A SCALENE triangle cannot be EQUILATERAL, because for all scalene triangles , the length of the three sides are all different and the angles are all different values. An EQUILATERAL triangles has its three sides of equal length , and its three angles all at 60 degrees.
The basic shape with 3 sides and 3 corners is called a triangle. A triangle is a polygon with three straight sides and three angles. It is the simplest polygon in Euclidean geometry.
1 triangle = 3 sides, no matter what kind of triangle it is 5 triangles = 3 sides each = 15 sides