Question

circle - circumference
example
circumference of a circle = 2πr or πd
diameter (d) = 8.53 m
circumference = πd
= 3.14×8.53
circumference = 26.78 m
find the circumference of each circle. round the answer to two decimal places. (use π = 3.14)
1)
2)
3)
circumference =
circumference =
circumference =
4)
5)
6)
circumference =
circumference =
circumference =
7)
8)
9)
circumference =
circumference =
circumference =

Explanation:

Step1: Recall the formula

The formula for the circumference of a circle is $C = \pi d$, where $C$ is the circumference and $d$ is the diameter.

Step2: Calculate for circle 1

For the first circle with $d = 7.44$ ft, $C=\pi d=3.14\times7.44 = 23.3616\approx23.36$ ft.

Step3: Calculate for circle 2

For the second circle with $d = 3.82$ in, $C=\pi d=3.14\times3.82 = 11.9948\approx11.99$ in.

Step4: Calculate for circle 3

For the third circle with $d = 13.2$ cm, $C=\pi d=3.14\times13.2 = 41.448\approx41.45$ cm.

Step5: Calculate for circle 4

For the fourth circle with $d = 6.75$ m, $C=\pi d=3.14\times6.75 = 21.195\approx21.20$ m.

Step6: Calculate for circle 5

For the fifth circle with $d = 19.3$ ft, $C=\pi d=3.14\times19.3 = 60.502\approx60.50$ ft.

Step7: Calculate for circle 6

For the sixth circle with $d = 18.6$ cm, $C=\pi d=3.14\times18.6 = 58.404\approx58.40$ cm.

Step8: Calculate for circle 7

For the seventh circle with $d = 12.4$ in, $C=\pi d=3.14\times12.4 = 38.936\approx38.94$ in.

Step9: Calculate for circle 8

For the eighth circle with $d = 5.55$ ft, $C=\pi d=3.14\times5.55 = 17.427\approx17.43$ ft.

Step10: Calculate for circle 9

For the ninth circle with $d = 10.9$ m, $C=\pi d=3.14\times10.9 = 34.226\approx34.23$ m.

Answer:

1. $23.36$ ft
2. $11.99$ in
3. $41.45$ cm
4. $21.20$ m
5. $60.50$ ft
6. $58.40$ cm
7. $38.94$ in
8. $17.43$ ft
9. $34.23$ m