The points $(-5, 0)$, $(5, 0)$ and $(0, 4)$ are the vertices of a triangle which is also:

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Step 1: Distance from $(-5,0)$ to $(0,4) = \sqrt{25+16} = \sqrt{41}$. Distance from $(5,0)$ to $(0,4) = \sqrt{25+16} = \sqrt{41}$. Two sides are equal, so it is an isosceles triangle.

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