Question'ythagoras' theorem can be used to work out an unknown side length of a rightangled triangle.
Copy and complete the workings below to calculate the unknown side length, $a$. $$\begin{aligned} a^{2}+8^{2} & =17^{2} \\ a^{2} & =17^{2}-8^{2} \\ a^{2} & =\ldots \\ a & =\ldots . \end{aligned}$$ ans
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