Question

4. Chris is given different lengths of board and told to make a triangle with three. Whichof the following lengths could Chris use to make the triangle?

Answer 1

we will use the Pythagorean theorem

$\begin{gathered} a^2+b^2=c^2 \\ 5^2+b^2=9^2 \\ 25+b^2=81 \\ 25+b^2-25=81-25 \\ b^2=56 \\ b=\sqrt[]{56}=8 \end{gathered}$

answer: d. 8 cm