\begin{minipage}{0.55\textwidth}
  \refstepcounter{minipagecount}
  \noindent{(\theminipagecount)}\quad
 \begin{tikzpicture}[scale=1.0, baseline=(current bounding box.north)]
    \begin{scope}[rotate=<<rotation>>]
        % Draw

        \draw (0,0) coordinate (<<vA>>) --
         ++(<<sidelength1>>,0) coordinate (<<vB>>) --
         ++(90:<<sidelength2>>) coordinate (<<vC>>) -- cycle;

        \pic [draw, -, angle radius=0.2cm] {right angle=<<vC>>--<<vB>>--<<vA>>};

        % Vertex LABELS
        % Labels relative to shape geometry
        \node at ($(<<vA>>)+(-0.2,-0.2)$) {<<vA>>};
        \node at ($(<<vB>>)+(0.2,-0.2)$) {<<vB>>};
        \node at ($(<<vC>>)+(0.2,0.2)$) {<<vC>>};


        % dotted/dashed arrows shifted away from edges
        % Horizontal side (A-B), shifted down
        \draw[<->, gray]
            ($(<<vA>>) + (0,-0.6cm)$) -- ($(<<vB>>) + (0,-0.6cm)$)
            node[black, midway, fill=white, inner sep=2.5pt] {<<calc_sidelength1>>\,cm};

        % Vertical side (B-C), shifted right
        \draw[<->, gray]
            ($(<<vB>>) + (0.6cm,0)$) -- ($(<<vC>>) + (0.6cm,0)$)
            node[black, midway, fill=white, xshift=0mm, inner sep=2.5pt] {<<calc_sidelength2>>\,cm};

    \end{scope}
\end{tikzpicture}
\end{minipage}%
\hfill
\begin{minipage}{.4\textwidth}
  \begin{align*}
    \text{Area} &= \frac{1}{2} \text{bh} \\
    \text{Area} &= \frac{1}{2} \times <<calcside_value1>> \text{cm} \times <<calcside_value2>> \text{cm}  \\
    \text{Area} &= <<calcarea_value>> \text{cm}^2
  \end{align*}
\end{minipage}