Quadratic Equation Calculator
Solve quadratic equation ax²+bx+c=0. Calculate discriminant and roots online for free.
Current for 2026Methodology →
Area calculator — geometric shapes
Select a shape, enter dimensions and get the area in square metres, centimetres and millimetres.
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Area formulas
Rectangle: a × b; Square: a²; Triangle: (a × h) / 2; Circle: π × r²; Trapezoid: ((a+b) × h) / 2; Rhombus: (d1 × d2) / 2.
Example: rectangle 4 × 5 m
Rectangle 4 m × 5 m: area = 20 m² = 200,000 cm². Circle radius 5 m: area = π × 5² ≈ 78.54 m².
Frequently asked questions
Geometric results are mathematically precise. Actual room areas may differ due to building construction.