Question

If you know the diameter of a circle, how do you find its circumference?
Group of answer choices

Answer 1

Answer:

circumference of a circle $C = 2\pi r=\pi (d)$

Step-by-step explanation:

Explanation:-

Circumference of a circle having radius is $C = 2\pi r$

we know that the radius of circle is 'r'

The diameter of a circle is passing through the center of the given circle.

there fore the diameter of circle is equal to the two times of radius of given circle so   d= 2 r

Circumference of a circle having diameter is

$C= 2\pi r = 2r(\pi )$........(1)

we know that d = 2 r

now the equation (1) is $C= d\pi$

Therefore The circumference of circle by using diameter is

$C = \pi d$