The body has symmetry. The right and left sides are (near) mirror images.
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Real-life objects that have three lines of symmetry are equilateral triangles, certain types of stars (such as a six-pointed star), and certain types of flowers (like a trillium). These objects have rotational symmetry of order three, meaning they can be rotated by 120 degrees and still look the same. The three lines of symmetry intersect at angles of 120 degrees, dividing the object into three equal parts.
Proportions are used in real life to determine prices of things.
Believe it or not, school is a real life situation. If you are using it in school it real life for you.
If you are in school and are studying trig then you are using trig in real life.