Question

1 a.
circle with radius labeled r = 3.5 yd
calculate the circumference of the circle.
1 b.
circle with diameter labeled d = 8 yd
calculate the circumference of the circle.
2 a.
circle with radius labeled r = 4.8 m
calculate the circumference of the circle.
2 b.
circle with diameter labeled d = 4.6 m
calculate the circumference of the circle.
3 a.
circle with diameter labeled d = 3.2 cm
calculate the circumference of the circle.
3 b.
circle with radius labeled r = 8.2 cm
calculate the circumference of the circle.

Explanation:

Step1: Recall circumference formulas

Circumference: $C=2\pi r$ or $C=\pi d$ ($\pi\approx3.14$)

Step2: Calculate 1a

$r=3.5$ yd, $C=2\times3.14\times3.5=21.98$ yd

Step3: Calculate 1b

$d=8$ yd, $C=3.14\times8=25.12$ yd

Step4: Calculate 2a

$r=4.8$ m, $C=2\times3.14\times4.8=30.144$ m

Step5: Calculate 2b

$d=4.6$ m, $C=3.14\times4.6=14.444$ m

Step6: Calculate 3a

$d=3.2$ cm, $C=3.14\times3.2=10.048$ cm

Step7: Calculate 3b

$r=8.2$ cm, $C=2\times3.14\times8.2=51.496$ cm

Answer:

1a: 21.98 yd
1b: 25.12 yd
2a: 30.144 m
2b: 14.444 m
3a: 10.048 cm
3b: 51.496 cm