High School

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Find the circumference of a circle with a radius of 3.5 cm. Take [tex]\pi = \frac{22}{7}[/tex].

A. 11 cm
B. 22 cm
C. 35 cm
D. 38.5 cm

Answer :

To find the circumference of a circle, we use the formula:

[tex]\[ \text{Circumference} = 2 \times \pi \times \text{radius} \][/tex]

Given:
- The radius of the circle is 3.5 cm.
- We are to take [tex]\(\pi = \frac{22}{7}\)[/tex].

Let's substitute these values into the formula:

1. Substitute the radius and [tex]\(\pi\)[/tex] values into the formula:
[tex]\[
\text{Circumference} = 2 \times \frac{22}{7} \times 3.5
\][/tex]

2. Calculate the multiplication:
[tex]\[
\text{Circumference} = 2 \times 11
\][/tex]

3. Finish the calculation:
[tex]\[
\text{Circumference} = 22
\][/tex]

So, the circumference of the circle is 22 cm. Therefore, the correct option is B.

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