Trong mặt phẳng với hệ tọa độ $Oxy,$ cho hai điểm $M\left( {4;3} \right);$ $N\left( { - 4; - 3} \right).$ Biết $MN$ là đ?
![](https://m.moon.vn/Images/Teachers/nguyenoanh8892/To%C3%A1n/04/1/26.png)
A.
![](https://m.moon.vn/Images/Teachers/nguyenoanh8892/To%C3%A1n/04/1/26a.png)
B.
![](https://m.moon.vn/Images/Teachers/nguyenoanh8892/To%C3%A1n/04/1/26b.png)
C.
![](https://m.moon.vn/Images/Teachers/nguyenoanh8892/To%C3%A1n/04/1/26c.png)
D.
![](https://m.moon.vn/Images/Teachers/nguyenoanh8892/To%C3%A1n/04/1/26d.png)
Đáp án D
![](https://m.moon.vn/Images/Teachers/nguyenoanh8892/To%C3%A1n/04/1/26e.png)