Question

find the circumference of circle when the diameter is 4.5cm​

Answer 1

⚫ANSWER⚫

If diameter = 4.5

Then radius

= 4.5 ÷ 2

= 2.25

Circumference of circle

$= 2\pi \: r \\ = 2 \times \frac{22}{7} \times 2.25 \\ = \frac{44}{7} \times 2.25 \\ = \frac{99}{7} \\ = 14.14$

14.14 is the required answer.

Answer 2

Answer:

The circumference of a circle is 14.13 cm.

Step-by-step explanation:

The circumference of a circle is defined as the total length of the boundary of a circle.

More precisely, circumference of a circle is the perimeter of a circle.

Circumference = $2\pi r$, where $r$ is the radius of a circle.

Step 1 of 1

Given: The diameter of a circle = 4.5 cm

Then,

The radius of the a circle, $r$ = diameter/2

                                              = 4.5/2

                                              = 2.25 cm

Now,

The circumference of a circle = $2\pi r$

                                                 = $2\times \pi \times 2.25$

                                                 = $2\times3.14\times2.25$ (Since $\pi = 3.14$)

                                                 = 14.13 cm

Thus, the circumference of a circle is 14.13 cm.

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