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seropon [69]
3 years ago
13

If the circumference of a circular region is 18 π cm, then what is its area?

Mathematics
2 answers:
mars1129 [50]3 years ago
8 0

Answer:

81\pi

Answer B is correct

Step-by-step explanation:

c = 2\pi \: r \\ 18\pi = 2\pi \: r \\  \frac{18\pi}{2\pi}  = r \\ raduis = 9

area = \pi {r}^{2}  \\  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  = 9 \times 9 \times \pi \\  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  = 81\pi

olganol [36]3 years ago
8 0

Answer:

b

Step-by-step explanation:

2pi r = 18pi

r= 9 pi

a= pi r square

= pi ×9 square

=81 pi cm square

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Use the Law of Sines to solve for x. Round to the nearest whole number.
bagirrra123 [75]

Answer:

12.94

Step-by-step explanation:

By the law of sines:

x / sin(35) = 7.9 / sin70

x = 7.9 * sin(70)/sin(35)

= 7.9 * 0.9397 / 0.5736

= 12.94

6 0
3 years ago
Anyone know how to do this?
alexgriva [62]

Answer:

60.22in^2.

Step-by-step explanation:

First, find the area of the rectangle. 14.1x7=98.7.

Then, we need to find the area of the circle and subtract it from the area of the rectangle.

The area of the circle is pi*r^2. so, pi*3.5^2 is about 38.48. (The radius is half of the diameter, so the radius would be 3.5).

Since there are two halves of the circle, we can just subtract 38.48 from 98.7 so get the area of the shaded region. So, the area of the yellow area is 60.22in^2.

4 0
3 years ago
Read 2 more answers
8x+3y=18
Minchanka [31]

Step-by-step explanation:

8x+3y=18

subject y according y=mx+c

y=8/3x-6

(-9,-13)

substitute -9 to y=8/3x-6

-13=8/3×(-9)+c

11=c

y=8/3x+11

3 0
4 years ago
Help me find the answerr
notka56 [123]

Answer:

m∠3 = 24°

Step-by-step explanation:

By the theorem,

"Intercepted arc measures the double of the inscribed angle formed by two chords meeting at one point of the circle."

In the given picture,

∠3 is the inscribed angle subtended by the arc ED and is the intercepted arc.

Therefore, m∠3 = \frac{1}{2}m(\text{arc}ED)

m∠3 = \frac{1}{2}(48)

        = 24°

Measure of angle 3 is 24 degrees.

6 0
3 years ago
Suppose y = 2x + 1 , where x and y are functions of t. (a) if dx/dt = 6, find dy/dt when x = 4. dy dt = (b) if dy/dt = 2, find d
evablogger [386]

y=2x+1\\\\\dfrac{dy}{dt}=2\dfrac{dx}{dt}

(a) For dx/dt=6, dy/dt = 2·6 = 12

(b) For dy/dt=2, 2 = 2·dx/dt ⇒ dx/dt = 1

_____

The value of x is irrelevant for this question.

=====

If your function is 2^x +1 or 2^(x +1), it needs to be written as such. The answer above applies to the function given.

7 0
3 years ago
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