Which of the following uses the correct formula to find the approximate circumference of a circle that has a radius of 12? Use 3.14 for π and express your answer to the hundredths place.(1 point)
The correct formula to find the approximate circumference of a circle is C = 2πr.
Using this formula, the approximate circumference of a circle with a radius of 12 is:
C = 2 * 3.14 * 12 = 75.36
Therefore, none of the following options are correct.
Which of the following uses the correct formula to find the approximate circumference of a circle that has a radius of 450?(1 point)
Which of the following uses the correct formula to find the approximate circumference of a circle that has a radius of 450?(1 point)
Responses
C≈3.14⋅450÷2
upper C approximately equals 3.14 times 450 divided by 2
C≈3.14⋅150
upper C approximately equals 3.14 times 150
C≈3.14⋅4502
upper C approximately equals 3.14 times 450 squared
C≈2⋅3.14⋅450
The correct formula to find the approximate circumference of a circle is C = 2πr.
Using this formula, the approximate circumference of a circle with a radius of 450 is:
C = 2 * 3.14 * 450 = 2826
Therefore, the correct option is:
C≈2⋅3.14⋅450
Which formula correctly describes the proportional relationship between the circumference of a circle and the diameter?(1 point)
Responses
Cd=π
Start Fraction upper C over d End Fraction equals pi
π=dC
pi equals Start Fraction d over upper C
A=πr2
upper A equals pi r squared
C=πd
upper C equals Start Fraction pi over d End Fraction
The correct formula that describes the proportional relationship between the circumference of a circle and the diameter is:
C = πd
This means that the circumference (C) is equal to the diameter (d) multiplied by pi (π).
Therefore, the correct option is:
C=πd
Use the correct formula to find the area of a circle if the diameter is 21 mi. Round to the nearest hundredths place. Use 3.14 for π .(1 point)
Responses
1,384.74 mi.2
1,384.74 mi squared
65.94 mi.2
65.94 mi squared
131.88 mi.2
131.88 mi squared
346.19 mi.2
The correct formula to find the area of a circle is A = πr^2, where r is the radius of the circle.
Given that the diameter is 21 mi, we can find the radius by dividing the diameter by 2:
r = 21 mi / 2 = 10.5 mi
Using the formula and approximating π to 3.14, the area of the circle is:
A = 3.14 * (10.5 mi)^2 = 3.14 * 110.25 mi^2 = 345.915 mi^2
Rounding to the nearest hundredths place, the area is approximately 345.91 mi^2.
Therefore, the correct option is:
346.19 mi.2
The correct formula for finding the area of a circle?
The correct formula for finding the area of a circle is:
A = πr^2
Where A represents the area of the circle and r represents the radius.