Polygon Area and Perimeter Calculator
Instructions
To calculate the area and wetted perimeter of a channel cross section, begin at the top of the left bank and number each surveyed point, starting at 1, proceeding to the right bank. Enter the number of vertices in the form below, then enter each vertex's x and y values. After entering the required data, click the Calculate button to obtain the cross-sections's area and wetted perimeter. As written, the calculator can process up to 10 vertices.
After clicking the Calculate button, the coordinate values, area and perimeter will displayed using the specified number of decimal digits. The coordinate values displayed are those used to calculate the area and perimeter, so changing the displayed decimal digits may change the x and y coordinate values and may result in the calculation of different values for the polygon's area and perimeter. For many practical problems of interest, results calculated and displayed using 3 decimal digits are adequate.
Clicking the Reset button will erase the form's content and set the number of vertices and displayed decimal digits to 3.