The diameter of a circle is 4 cm which equation can be used to find its circumference:

c= pi x 2
c= pi x 4
c= pi x 4 / 2
c= pi x 4 a 4

The correct answer option is: C = pi × 4.

Step-by-step explanation:

We are given the diameter of a circle to be 4 cm and we are to determine which of the given equations can be used to find its circumference.

We know that the circumference of a circle is given by:

If diameter is 4 cm so the radius will be 2 cm so substituting it in the above formula to get the equation.

C = 2 × pi × 2 = pi × 4

C = π  * 4

Step-by-step explanation:

The equation of a circle's circumference is C = 2πr, or C = πd, where d is the diameter of the circle. Plugging our given in, we get C = π * 4.

answer: i think it's a

step-by-step explanation: