Question

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

Answer 1

C = π * 4

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 2

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

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:
`2\pi r`

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