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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?
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35 votes
35 votes
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?

4. Chris is given different lengths of board and told to make a triangle with three-example-1
User Yehudit
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1 Answer

21 votes
21 votes

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

User Craft
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