20 Circumference to Diameter
The diameter of a circle with circumference 20 is 6.3662. This page breaks down the calculation step by step.
Quick Answer
d = 6.3662
Circumference 20 ÷ π = 6.3662
How to Calculate
1
Start with the formula
Diameter = Circumference ÷ π
2
Substitute the values
d = 20 ÷ 3.14159…
3
Result
d = 6.3662
Related Measurements for Circumference 20
| Measurement | Value |
|---|---|
| Circumference (C) | 20 |
| Diameter (d = C ÷ π) | 6.3662 |
| Radius (r = d ÷ 2) | 3.1831 |
| Area (A = π × r²) | 31.8310 |
20 Circumference to Diameter in Different Units
The formula d = C ÷ π works identically in every unit. The diameter always comes out in the same unit as the circumference.
20 cm circumference
Diameter = 6.3662 cm
20 inches circumference
Diameter = 6.3662 inches
20 mm circumference
Diameter = 6.3662 mm
20 meters circumference
Diameter = 6.3662 m
Frequently Asked Questions
What is the diameter of a circle with circumference 20?
The diameter is 6.3662. Calculation: d = 20 ÷ π = 20 ÷ 3.14159 = 6.3662.
What is 20 inch circumference to diameter?
20 inches circumference equals a diameter of 6.3662 inches. Formula: d = C ÷ π. A 20-inch circumference is roughly the size of a small wheel or hat.
What is the radius of a 20 circumference circle?
The radius is half the diameter: r = 6.3662 ÷ 2 = 3.1831. Or use: r = C ÷ (2π) = 20 ÷ 6.28318 = 3.1831.
How do I find diameter from 20 cm circumference?
Divide 20 cm by π: d = 20 ÷ 3.14159 = 6.3662 cm. The answer is always in the same unit as the circumference you entered.
What is the area of a circle with circumference 20?
The area is 31.8310 square units. Formula: A = C² ÷ (4π) = 400 ÷ 12.56637 = 31.8310.
How would you measure a 20-unit circumference object?
For physical objects — like a pipe, jar, or hat — wrap a flexible tape measure around the widest circular point. If it reads 20 cm, the diameter is 20 ÷ π = 6.3662 cm. A vernier caliper can confirm the diameter directly on solid round objects.
Is the circumference-to-diameter ratio always π for circumference 20?
Yes. 20 ÷ 6.3662 = π (3.14159). This ratio is constant for every circle. It was first calculated by Archimedes and later refined to 35 decimal places by Ludolph van Ceulen. The ratio is the same whether the circumference is 20 mm, 20 cm, or 20 miles.