The perimeter of an equilateral triangle is d cm. Write down an expression for the length, in centimeters, of each of the two sides.
here is the answer \(x = {-b \pm \sqrt{b^2-4ac} \over 2a}\begin{pmatrix} 1\\ 2 \end{pmatrix}\begin{bmatrix} 1 && 2 \\ 3 && 4 \end{bmatrix}\theta \Delta \Leftarrow\left ( \right )\begin{bmatrix} 1 && 2 \\ 3 && 4 \end{bmatrix}\varepsilon {}^{}\Delta \)