Aren't triangles structurally strong? So they are used in bridges and architechture.
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There are many uses of similar triangles in daily life. These triangles can create the symmetry in art and other aspects that they enjoy.
hihi
Similar triangles can be used in many situations in which angles of two differently-sized triangles are the same. Optics, scale modeling,trigonometry, surveying, astronomy, and many, many other applications of mathematics rely on the concept of similarity.
dick
It usually isn't. Scientific notation is used for very large and very small numbers, that are not normally used in your daily life. Unless your "daily life" involves work in science or engineering.