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GeomBench
Width × height — with perimeter and diagonal thrown in for free.
Width and height alone determine everything else about a rectangle: area (w×h) for covering it, perimeter (2(w+h)) for framing it, and the diagonal (via the Pythagorean theorem) for confirming it's a true rectangle and not a skewed parallelogram.
Flooring, paint coverage, screen and paper sizes, room layouts, and shipping box dimensions are almost always rectangular — this is the single most common area calculation in everyday life.
Area
40
A = w × h
What you entered
Area
8 × 5= 40Perimeter
2 × (8 + 5)= 26Diagonal
√(8² + 5²)= 9.434Result
Area: 40
A 8 × 5 rectangle has an area of 40, a perimeter of 26, and a diagonal of 9.434.