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7nadin3 [17]
2 years ago
9

The diameter of a circle is 20 m. Find the circumference to the nearest tenth.​

Mathematics
2 answers:
Ainat [17]2 years ago
8 0

Answer:

about 62.8 meters

Step-by-step explanation:

c = 20\pi = 62.8

Nadusha1986 [10]2 years ago
3 0
ANSWER: 62.83 m


explanation- c=2 pie

d=2r

c=pie d=pie • 20 = 62.83185 m
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The circle will be enlarged by a scale factor of 4.
sertanlavr [38]

Answer:

The area of the new circle is  144\pi \ in^2

Step-by-step explanation:

Given:

radius of the circle = 3 in.

we know that

If two figures are similar, then the ratio of its areas is equal to the scale factor squared.

Let

z-----> the scale factor

x-----> the area of the enlarged circle

y-----> the area of the original circle

So;

z^2= \frac{x}{y}

In this problem we have

z=4 ----> the scale factor

The area of the original circle is equal to

y = \pi r^2= \pi (3)^2= 9\pi \ in^2

Now substituting value of y and solve for x we get;

4^2=\frac{x}{9\pi}\\ \\x= 16\times9\pi= 144\pi \ in^2

Hence Area of the new Circle is 144\pi \ in^2

Also The area of the enlarged circle is 16 times the area of the original circle.

4 0
4 years ago
Otra forma de representar 42/9​
Oksi-84 [34.3K]

Answer:

(84/18, 14/3). These are the same as 42/9

3 0
3 years ago
Which ordered pair is the best estimate for the solution of the system of equations? y=−2/5x−2y=5x+1
lutik1710 [3]

Option a: (-0.5,-1.75) is the solution to the system of equations.

Explanation:

The equations are y=-\frac{2}{5} x-2 and y=5 x+1

Equating these two equations, we have,

-\frac{2}{5} x-2=5 x+1

Taking LCM and multiplying both sides by 5, we get,

-2 x-10=25 x+5

Simplifying , we get,

\begin{aligned}-10-5 &=25 x+2 \\-15 &=27 x \\-\frac{15}{27} &=x \\-\frac{5}{9}  &=x\end{aligned}

Substituting the value of x in y=5 x+1, we get,

\begin{aligned}&y=5\left(-\frac{5}{9}\right)+1\\&y=-\frac{25}{9}+1\\&y=-\frac{16}{9}\end{aligned}

Thus, the solution is \left(-\frac{5}{9},-\frac{16}{9}\right)

Changing the solution from fraction to decimal, we get, (-0.556,-1.778)

Thus, the solution is (-0.5,-1.75)

Hence, option a is the correct answer.

4 0
3 years ago
You need a shelf for a small space in your house, so you make a measurement with your meter stick and head to the store. Once th
DochEvi [55]

Answer:

1. 0.3 m

2. yes

Step-by-step explanation:

The computation is shown below:

Given that

Measurement of space = 0.8m

measurement of the shelves = 30 cm = 0.3 m as 1 m = 100 cm

So for 30 cm it would be

= 0.30 ÷ 100

= 0.3 m

Based on the above information,

1. The number of meters wide for the shelf to buy is 0.3 m

2 And yes it is fitted in the house

6 0
3 years ago
For what valuels of x is the equation |4x + 2| = x + 8 TRUE?
dmitriy555 [2]

Answer:

x=-2\quad \mathrm{or}\quad \:x=2

Step-by-step explanation:

|4x + 2| = x + 8 \\\\\mathrm{For\:each\:absolute\:find\:positive\:and\:negative\:intervals}\\\\\mathrm{Solve\:the\:inequality\:for\:each\:interval:}\\\\\mathrm{For\:}x

5 0
3 years ago
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