Semicircle Area Calculator

Calculates the surface area of a semicircle using simple input measurements. Users enter either the radius or the diameter, and the tool immediately computes the precise amount of space enclosed within the half-circle shape. Additionally, the utility provides the circumference of the semicircular arc, giving users both the internal area measurement and the length around the curved edge. The calculations are based on standard geometric formulas for these specific two-dimensional forms. Serves students studying geometry, architects designing curved elements, or anyone needing quick mathematical verification involving half-circles. It is useful for visualizing shapes that are cut in half from a perfect circle, such as calculating material needed for decorative arches or understanding properties of semi-circular objects.