Answer:
In the picture.
Step-by-step explanation:
In the picture.
Find the circumference of a circle whose area is 24pi ft^2
2 answers:
Answer:
30.76
Step-by-step explanation:
To calculate the circumference of a circle you just have to multiply the diameter by pi.
C= D*
And in order to calculate the value of the diameter you have to clear the formula for the area.
A=
r=
r=
r=4,89
Once we get the radius, we only have to calculate the diameter:
D=2r=9,79
now we just calculate the circumference:
C=D*= (9.79)(3.14)= 30.76
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Answer:
center: (2, -4); radius: 5
Step-by-step explanation:
Group x-terms and y-terms. Add the squares of half the coefficient of the linear term in each group. It can be convenient to subtract the constant, too.
(x^2 -4x) +(y^2 +8y) = 5
(x^2 -4x +4) +(y^2 +8x +16) = 5 + 4 + 16
(x -2)^2 +(y +4)^2 = 5^2
Comparing this to the form of a circle centered at (h, k) with radius r, we can find the center and radius.
(x -h)^2 +(y -k)^2 = r^2
(h, k) = (2, -4) . . . . . the circle center
r = 5 . . . . . . . . . . . . the radius
