We are given the Young's modulus $E = 2 \times 10^5 \text{ N/mm}^2$ and the cross-sectional area $A = 1.25 \times 10^{-4} \text{ m}^2$.
First, let's identify the nodes and elements of the truss.
Nodes are A, B, and C.
Elements are AB, AC, and BC.
Let's define
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