Name the type of triangle formed by the points $ \mathrm{A}(-5,6), \mathrm{B}(-4,-2) $ and $ \mathrm{C}(7,5) $.
Given:
The points \( \mathrm{A}(-5,6), \mathrm{B}(-4,-2) \) and \( \mathrm{C}(7,5) \).
To do:
We have to find the type of triangle formed by the given points.
Solution:
We know that,
The distance between the points $(x_{1}, y_{1})$ and $(x_{2}, y_{2})=\sqrt{(x_{2}-x_{1})^{2}+(y_{2}-y_{1})^{2}}$
The distance between $A(-5,6)$ and $B(-4,-2) is,
$A B =\sqrt{(-4+5)^{2}+(-2-6)^{2}}$
$=\sqrt{1^{2}+(-8)^{2}}$
$=\sqrt{1+64}$
$=\sqrt{65}$
The distance between $B(-4,-2)$ and $C(7,5)$ is,
$BC =\sqrt{(7+4)^{2}+(5+2)^{2}}$
$=\sqrt{(11)^{2}+(7)^{2}}$
$=\sqrt{121+49}$
$=\sqrt{170}$
The distance between $C(7,5)$ and $A(-5,6)$ is,
$CA=\sqrt{(-5-7)^{2}+(6-5)^{2}}$
$=\sqrt{(-12)^{2}+1^{2}}$
$=\sqrt{144+1}$
$=\sqrt{145}$
$AB^2+CA^2=(\sqrt{65})^2+(\sqrt{145})^2$
$=65+145$
$=210$
$BC^2=(\sqrt{170})^2$
$=170$
Here,
$AB ≠ BC ≠ CA$ and $AB^2+CA^2≠BC^2$
Therefore, the points \( \mathrm{A}(-5,6), \mathrm{B}(-4,-2) \) and \( \mathrm{C}(7,5) \) form a scalene triangle.
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