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

        \coordinate (<<vA>>) at (0,0);
        \coordinate (<<vB>>) at (<<base>>,0);
        \coordinate (<<vD>>) at ($(<<vB>>)+(<<rightoffset>>,0)$);  % extend out
        \coordinate (<<vC>>) at ($(<<vD>>)+(0,<<height>>)$); % Perpendicular upwards

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

        % Vertex LABELS
        % Labels relative to shape geometry
        \node at ($(<<vA>>)+(-0.2,-0.2)$) {<<vA>>};
        \node at ($(<<vB>>)+(0.0,-0.2)$) {<<vB>>};
        \node at ($(<<vD>>)+(0.2,-0.2)$) {<<vD>>};
        \node at ($(<<vC>>)+(0.2,0.2)$) {<<vC>>};


        % dotted/dashed arrows shifted away from edges
        % Horizontal side (A-B), shifted down yshift=0mm,
        \draw[<->, gray]
            ($(<<vA>>) + (0,-0.7cm)$) -- ($(<<vB>>) + (0,-0.7cm)$)
            node[black, midway, fill=white, inner sep=2.5pt] {<<calc_base>>\,cm};

        % Vertical side (D-C), shifted right xshift=0mm,
        \draw[<->, gray]
            ($(<<vD>>)+(0.6,0)$) -- ($(<<vD>> |- <<vC>>)+(0.6,0)$)
            node[black, midway, fill=white, inner sep=2.5pt] {<<calc_height>>\,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 <<calc_base_value>> \text{cm} \times <<calc_height_value>> \text{cm}  \\
    \text{Area} &= <<calcarea_value>> \text{cm}^2
  \end{align*}
\end{minipage}