Find the circumference of each circle. Round your answer to the nearest tenth.
diameter = 4 yd
diameter = 18 mi
diameter = 6 cm
radius = 7 in
radius = 3 yd
diameter = 24 ft
diameter = 22.6 yd
radius = 12 mi
radius = 4 m
radius = 10.3 m
11 __________
12 __________
13 __________
14 __________
15 __________
16 __________
17 __________
18 __________
19 __________
20 __________
To find the circumference of a circle, you can use the formula:
[ text{Circumference} = pi times d ]
or
[ text{Circumference} = 2 times pi times r ]
where ( d ) is the diameter and ( r ) is the radius. We’ll use ( pi approx 3.14 ) for this calculation. Let’s compute the circumference for each case:
1. For a diameter of 4 yd:
[
text{Circumference} = pi times 4 approx 3.14 times 4 = 12.6 , text{yd}
]
2. For a diameter of 18 mi:
[
text{Circumference} = pi times 18 approx 3.14 times 18 = 56.5 , text{mi}
]
3. For a diameter of 6 cm:
[
text{Circumference} = pi times 6 approx 3.14 times 6 = 18.8 , text{cm}
]
4. For a radius of 7 in:
[
text{Circumference} = 2 times pi times 7 approx 2 times 3.14 times 7 =