Круг, треугольник, прямоугольник, трапеция, ромб, эллипс — площадь и периметр
The shape area calculator finds the area and perimeter of six geometric shapes: circle, triangle (Heron's formula), rectangle, trapezoid, rhombus and ellipse.
Circle: S = πr², P = 2πr. Triangle (Heron): s = (a+b+c)/2, S = √(s(s−a)(s−b)(s−c)). Rectangle: S = a×b, P = 2(a+b). Trapezoid: S = (a+b)/2×h. Rhombus (diagonals): S = d₁×d₂/2. Ellipse: S = π×a×b.
Triangle with sides 3, 4, 5: s = 6, S = √(6×3×2×1) = 6 sq units. Rectangle 5 × 4: S = 20, P = 18.
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