$\triangle$ABC is an isosceles triangle.
Work Step by Step
AB+BC+CA=40 10+x+6+2x-3=40 3x+13=40 3x=27 x=9 BC=x+6 BC=9+6 BC=15 CA=2x-3 CA=2(9)-3 CA=18-3 CA=15 BC=CA
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