French curves are used as templates to draw curved lines. They are used in both designing clothing and designing cars. The person drawing the dress or car places the appropriate size curve on the paper and pencils around it.
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A heart shape isn't a polygon because a heart has to curves. The description of a polygon doesn't list curves.
Three
It is geometry.
geometry
apolygon is a shape that has no curves ,is closed, and has more then three sides