If another triangle has the same three sides, that is, sides of the same length, it will have the same area. Note that this is a sufficient, but not a necessary, condition, since you can also have triangles of a different shape that have the same area.
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None. It is possible to have many triangles in which nothing but their area is the same.
Yes they are similar
When you multiple the area of the small triangle by four it equals the area of the large triangle.
For all triangles: area = 1/2 * base * height
the area of a triangle is half that of a rectangle made using two of those triangles.
For all triangles: area = 1/2 * base * height