The area of B is 144pi ft2 Find the circumference of b

Mathematics

2 answers:

baherus [9]3 years ago

8 0

A c=12 pi ft i think

juin [17]3 years ago

5 0

First, we use the area an the formula of the area to find the radius of the circle.

Area of circle = pi * r^2

144 pi ft^2 = pi * r^2

r^2 = 144 ft^2

r = 12 ft

The radius of the circle is 12 ft.

Now we use the circumference formula to find the circumference of the circle.

circumference of circle = 2 pi r

C = 2 * pi * 12 ft

C = 24pi ft

You might be interested in

Expand.<br> Your answer should be a polynomial in standard form.<br> (5r+2)(5r-2)=

djverab [1.8K]

Answer:

131.25

Step-by-step explanation:

25r²-10r+10r-4=0

25r²-4=0 (Since -10 and 10 cancel each other out)

25r²=4

Divide both sides by 4 to get r² = 6.25

Square both sides to get r = 2.5

Plug 2.5 back into the equation to get the answer of 131.25

8 0

3 years ago

T= k/k-2

mart [117]

Answer:

Step-by-step explanation:

$t=\frac{k}{k-2} \\t(k-2)=k\\tk-2t=k\\-2t=k-tk\\-2t=k(1-t)\\\frac{-2t}{1-t}=k\\k= \frac{-2t}{1-t}$

5 0

3 years ago

URGENT: statistics: A researcher wishes to estimate the percentage of adults who support abolishing the penny what size sample s

irina1246 [14]

Using the margin of error for the z-distribution, the sample sizes are given as follows:

a) 822.

b) 1068.

<h3>What is a confidence interval of proportions?</h3>

A confidence interval of proportions is given by:

$\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}$

The margin of error is given by:

$M = z\sqrt{\frac{\pi(1-\pi)}{n}}$

In which:

$\pi$ is the sample proportion.

z is the critical value.

n is the sample size.

We have a 95% confidence level, hence $\alpha = 0.95$ , z is the value of Z that has a p-value of $\frac{1+0.95}{2} = 0.975$ , so the critical value is z = 1.96.