Precision Geometry Engine
Circle Calculator: Radius, Area & Circumference
Instant circle property analysis with high-precision mathematical constants.
r
Total Surface Area
314.16
Square Units
Circumference
62.83
Perimeter of circle
Diameter
20.00
Distance across center
Geometric Parameters
Quick Formula: The area is determined by the square of the radius multiplied by Pi ($$A = \pi r^2$$).
Understanding Circle Geometry
A circle is a unique geometric shape where all points on its boundary are at an equal distance from the center. Our online circle calculator is designed for architects, students, and engineers who require instant and precise property analysis of circular shapes.
Mathematical Formulas Used:
Area: $$A = \pi r^2$$
Circumference: $$C = 2\pi r$$
Diameter: $$D = 2r$$
Professional Geometrical Computation