Geometry Calculator

Formulas

• Circle: Area = πr², Circumference = 2πr
• Rectangle: Area = a × b, Perimeter = 2(a + b)
• Triangle: Area via Heron's formula √(s(s-a)(s-b)(s-c))
• Square: Area = a², Perimeter = 4a
• Trapezoid: Area = (a + b) / 2 × h
• Parallelogram: Area = base × height
• Ellipse: Area = πab, Perimeter ≈ 2π√((a²+b²)/2)
• Sector: Area = ½r²θ (θ in radians)