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Треугольник ABC со сторонами AB, BC, CA
![AB = sqrt{ ( x_{B} - x_{A} )^{2} + ( y_{B} - y_{A} )^{2}} = sqrt{ ( 3 - 0 )^{2} + (4 - 0)^{2}} = sqrt{9+16} AB = sqrt{ ( x_{B} - x_{A} )^{2} + ( y_{B} - y_{A} )^{2}} = sqrt{ ( 3 - 0 )^{2} + (4 - 0)^{2}} = sqrt{9+16}](https://tex.z-dn.net/?f=AB+%3D++sqrt%7B+%28+x_%7BB%7D+-+x_%7BA%7D+%29%5E%7B2%7D+%2B++%28+y_%7BB%7D+-++y_%7BA%7D+%29%5E%7B2%7D%7D+%3D++++sqrt%7B+%28+3+-+0+%29%5E%7B2%7D+%2B++%284+-++0%29%5E%7B2%7D%7D+%3D++sqrt%7B9%2B16%7D+)
см
![BC = sqrt{ ( x_{C} - x_{B} )^{2} + ( y_{C} - y_{B} )^{2}} = sqrt{(4-3)^{2} + (3-4)^{2}} = sqrt{1+1} BC = sqrt{ ( x_{C} - x_{B} )^{2} + ( y_{C} - y_{B} )^{2}} = sqrt{(4-3)^{2} + (3-4)^{2}} = sqrt{1+1}](https://tex.z-dn.net/?f=BC+%3D+sqrt%7B+%28+x_%7BC%7D+-+x_%7BB%7D+%29%5E%7B2%7D+%2B+%28+y_%7BC%7D+-+y_%7BB%7D+%29%5E%7B2%7D%7D+%3D+sqrt%7B%284-3%29%5E%7B2%7D+%2B+%283-4%29%5E%7B2%7D%7D+%3D+sqrt%7B1%2B1%7D+)
см
![CA = sqrt{ ( x_{A} - x_{C} )^{2} + ( y_{A} - y_{C} )^{2}} = sqrt{(0-4)^{2} + (0-3)^{2}} = sqrt{16+9} CA = sqrt{ ( x_{A} - x_{C} )^{2} + ( y_{A} - y_{C} )^{2}} = sqrt{(0-4)^{2} + (0-3)^{2}} = sqrt{16+9}](https://tex.z-dn.net/?f=CA+%3D+sqrt%7B+%28+x_%7BA%7D+-+x_%7BC%7D+%29%5E%7B2%7D+%2B+%28+y_%7BA%7D+-+y_%7BC%7D+%29%5E%7B2%7D%7D+%3D+sqrt%7B%280-4%29%5E%7B2%7D+%2B+%280-3%29%5E%7B2%7D%7D+%3D+sqrt%7B16%2B9%7D+)
см
Приложения:
![](https://st.uroker.com/files/8d0/8d02596eb201e660f1523ec1e8b63e4b.jpg)
Ответ дал:
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Это длина сторон по точкам(координатам) вершин
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