Question:medium

The figure below shows a contour diagram and two points (A \& B) on the continuously ascending surface. The horizontal projection of AB is 200 m long, and the gradient of AB is 1 in 25. The constant contour interval (in m) is \underline{\hspace{1cm}} [in integer]. \begin{center} \includegraphics[width=0.5\textwidth]{09.jpeg} \end{center}

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In contour problems, always use the gradient formula to convert horizontal distance into vertical rise. Then divide the vertical rise by the number of contour crossings to get the contour interval.
Updated On: Nov 25, 2025


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