Perimeter is the sum of all sides of a shape
then if we sum all sides of the triangle we have 26
we write this like a equation making the missing measure x
[tex]7+7+x+x=26[/tex]simplify
[tex]14+2x=26[/tex]and find x subtracting 14 on both sides
[tex]\begin{gathered} 14-14+2x=26-14 \\ 2x=12 \end{gathered}[/tex]and dividing by 2 to solve x
[tex]\begin{gathered} \frac{2x}{2}=\frac{12}{2} \\ \\ x=6 \end{gathered}[/tex]the value of the missing side is 6
we can check finding the perimeter again
[tex]\begin{gathered} 7+7+6+6 \\ 14+12 \\ =26 \end{gathered}[/tex]perimeter is right then the values of the side is right too
