Question

is similar triangle is different from similar polygon? why?

Answer 1

When two bodies have same shape that is called similar. I think Polygon's has different shape than a triangle. Triangle has three sides but polygon is formed by bounded a finite chain of straight line segments.

Answer 2

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Two triangles are said to be similar if their corresponding angles are congruent and the corresponding sides are in proportion . In other words, similar triangles are the same shape, but not necessarily the same size. The triangles are congruent if, in addition to this, their corresponding sides are of equal length.