Math · Free Online Tool
Area of a Circle Calculator
Calculate circular area, diameter, circumference, radius, and sector slice geometry.
Presets:
RADIUS SOLVER
78.5398 cm² cm²
Area
78.5398 cm²
Diameter
10 cm
Circumference
31.4159 cm
Exact Pi Area
25π cm²
Geometric Metric Profile
Calculated Area 78.54 cm²
Circumference Perimeter 31.416 cm
Diameter Span 10 cm
Frequently Asked Questions
Math · Related Calculators & Tools
Compound Interest Calculator
Model geometric wealth growth, periodic contributions, inflation adjustments, and annual compounding schedules.
Percentage Calculator
Solve percentage increases, decreases, differences, fractions to percents, and reverse percentage calculations.
Fraction Calculator
Add, subtract, multiply, divide, and simplify fractions with step-by-step common denominators and mixed numbers.
Quadratic Equation Solver
Solve second-degree polynomial equations ax² + bx + c = 0 with real and complex roots, vertex, and discriminant analysis.