$-3-9.$ The or$-$e diagram for a collagen fiber bundle from which a human tendos is composed is shown. If a segment of the Achilles tendoe at $4$ has a length of $6\mathrm{.}5$ in$.$ and an approximate crose$-$wectional area of $0\mathrm{.}229$ in ${?}^2,$ determine its clongatios if the foot sapports a load of $125$ lb $,$ which causes a teneion ia the tesdes ef $4175$ $h$.$