Calculate the circumference of the circles with the following dimensions. C = circumference
D = diameter
R = radius
PI = 3.14

1. D = 4 in D = 6 in D = 12 in
2. R = 2 ft R = 14 ft R = 12 ft
3. R = 9 ft R = 11 ft R = 7 ft
4. D = 10 ft R = 9 ft D = 13 ft
5. Application: Dana is planning to ride her bicycle around the circular race track and wants to know the distance. If the diameter of the track is 2 mile, how far is the distance around the race track?

Step-by-step explanation:

that is just calculator typing.

you really need help with that ?

the formula for the circumference of a circle is

2×PI×R

or correspondingly

PI×D

depending on whether we have the radius or the diameter (as the diameter is 2 times the radius).

now we just need to use the given numbers in these formulas and calculate.

1. 12.56 in 18.84 in 37.68 in

2. 12.56 ft 87.92 ft 75.36 ft

3. 56.52 ft 69.08 ft 43.96 ft

4. 31.4 ft 56.52 ft 40.82 ft

or maybe the middle of 4. should be D and not R ?

then it is 28.26 ft.

5. 6.28 miles

80π/3 or about 83.775

step-by-step explanation:

since a cone is 1/3 of a cylinder, we need to find the base's area. since area = πr^2, we get 16π. then, multiplying this by 5, we get 80π. dividing by 3, since the cone's volume is 1/3 of that of a cylinder's, we get 80π/3.

hope this !

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step-by-step explanation: