.Which formula correctly describes the proportional relationship between the circumference of a circle and the diameter?(1 point)
Responses
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
Cd=π
5 answers
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
346.19 mi.2
346.19 mi squared
131.88 mi.2
131.88 mi squared
65.94 mi.2
65.94 mi squared
1,384.74 mi.2
Responses
346.19 mi.2
346.19 mi squared
131.88 mi.2
131.88 mi squared
65.94 mi.2
65.94 mi squared
1,384.74 mi.2
To find the area of a circle, we use the formula A=πr^2, where r is the radius and d is the diameter.
Given that the diameter is 21 mi, so the radius (r) would be half of that, which is 21/2 = 10.5 mi.
Now, plug in the values into the formula:
A = π(10.5)^2
A = π(110.25)
A ≈ 346.19 mi^2
So, the correct answer is 346.19 mi^2.
Given that the diameter is 21 mi, so the radius (r) would be half of that, which is 21/2 = 10.5 mi.
Now, plug in the values into the formula:
A = π(10.5)^2
A = π(110.25)
A ≈ 346.19 mi^2
So, the correct answer is 346.19 mi^2.
Which of the following is the correct formula for finding the area of a circle?(1 point)
Responses
A=πr2
upper A equals pi r squared
A=πd
upper A equals pi d
A=2πr
upper A equals 2 pi r
A=C2÷4πA=πd2
Responses
A=πr2
upper A equals pi r squared
A=πd
upper A equals pi d
A=2πr
upper A equals 2 pi r
A=C2÷4πA=πd2
A=πr^2
(upper A equals pi r squared)
(upper A equals pi r squared)