[tex]AB = \sqrt{((1-(-7))^{2}+(-5-(-1) )^{2} } = \sqrt{(8^{2}+(-4)^{2} )} = \sqrt{80} = 4\sqrt{5}[/tex]
[tex]P = \frac{1}{2} *AB*h_{c}[/tex]
[tex]h_c = \frac{4\sqrt{5} }{2 * 4\sqrt{5} } \\h_c = \frac{2\sqrt{5} }{4\sqrt{5} } \\h_c = \frac{1}{2}[/tex]
[tex]P = \frac{1}{2} *AB*h_c\\P = \frac{1}{2} *4\sqrt{5} *\frac{1}{2} \\P = \sqrt{5}[/tex]
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[tex]AB = \sqrt{((1-(-7))^{2}+(-5-(-1) )^{2} } = \sqrt{(8^{2}+(-4)^{2} )} = \sqrt{80} = 4\sqrt{5}[/tex]
[tex]P = \frac{1}{2} *AB*h_{c}[/tex]
[tex]h_c = \frac{4\sqrt{5} }{2 * 4\sqrt{5} } \\h_c = \frac{2\sqrt{5} }{4\sqrt{5} } \\h_c = \frac{1}{2}[/tex]
Pole:
[tex]P = \frac{1}{2} *AB*h_c\\P = \frac{1}{2} *4\sqrt{5} *\frac{1}{2} \\P = \sqrt{5}[/tex]