Square Calc: find A, P, d

Calculates the area, perimeter, and diagonal of a square based on its side length input. Users enter one dimension, such as the length of an edge, and the tool instantly computes the other two key geometric measurements. The calculator uses standard formulas to derive the total enclosed space (area) and the distance around the outer boundary (perimeter), while also determining the length of the diagonal line connecting opposite corners. This utility is useful for students studying geometry or professionals needing quick dimensional verification. Anyone working on architectural plans, design projects, or general mathematical problems involving squares can use it efficiently. By providing all three primary measurements—area, perimeter, and diagonal—from a single input, the tool saves time and ensures accuracy when solving geometric problems related to square shapes.