![a) AB = \sqrt{(x_{2}-x_{1})^{2}+(y_{2}-y_{2})^{2}}\\\\=\sqrt{(11-[-4])^{2}+(5-[-8])^{2}}\\\\=\sqrt{(11+4)^{2}+(5+8)^{2}}}\\\\=\sqrt{15^{2}+13^{2}}\\\\\=\sqrt{225+169}\\\\=\sqrt{394}\\\\](/tpl/images/2512/8781/ad859.png)
Geometry
length midpoint and point
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