Question

finding the circumference
find the circumference (in cm) of the circle. circles
1)
2)
3)
4)
5)
7)

Explanation:

Step1: Recall circumference formula

The formula for the circumference of a circle is $C = 2\pi r$, where $r$ is the radius. For circles with a given diameter $d$, use $C = \pi d$ (since $r=\frac{d}{2}$). We use $\pi=3.14$.

Step2: Solve for Circle 1

Radius $r=13.5$ cm.
$C = 2\times3.14\times13.5 = 84.78$

Step3: Solve for Circle 3

Radius $r=2$ cm.
$C = 2\times3.14\times2 = 12.56$

Step4: Solve for Circle 5

Radius $r=11$ cm.
$C = 2\times3.14\times11 = 69.08$

Step5: Solve for Circle 7

Diameter $d=2$ cm.
$C = 3.14\times2 = 6.28$

Answer:

1. 84.78 cm
2. 12.56 cm
3. 69.08 cm
4. 6.28 cm