Question

how can we find the circumference by diameter

Answer 1

To calculate the circumference of a circle, multiply the diameter of the circle by π, which is equal to 3.14. If you don't have the diameter of the circle, use the radius to find thecircumference instead.

Answer 2

Half the diameter

The half of diameter will be its radius

Then put that radius in the formula

Circumference of circle = 2π ×radius

Or

Use

Circumference of circle = π × diameter