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slavikrds [6]
4 years ago
8

which of the following correctly explains why the formula for the circumference of a circle is 2 pi r. Pi is defined as the rati

o of the circumference of a circle to the diameter of that Circle.

Mathematics
2 answers:
Kobotan [32]4 years ago
8 0
Let 
C---------> the circumference of a circle
D---------> diameter of a circle
r----------> radius of a circle

we know that
C=2*pi*r
D=2*r
so
C=D*pi-------------> pi=C/D
<span>Pi is defined as the ratio of the circumference of a circle to the diameter of that Circle
when you multiply the diameter in both numerator and denominator
pi*D=(C/D)*D------> pi*D=C
and the diameter is two times the radius
so
D=2*r
C=pi*D------> C=pi*(2*r)-----> C=2*pi*r

therefore

the answer is the option D
</span>Two times r equals the diameter of the circle. Pi equals the circumference divided by the diameter. When you multiply, the diameter is in both the numerator and the denominator, which cancels out, leaving the circumference
Lady_Fox [76]4 years ago
4 0
Hello there!!! The Answer is D. I hope this helps have a great day!!!
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Dafna1 [17]
Your answer should be A, sorry if that’s incorrect it just makes the most sense! :)
7 0
3 years ago
I need help 2(x + 1) = 2x + 2.
Ksju [112]
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7 0
3 years ago
Which equation can be used to represent this information?
bogdanovich [222]

Answer:

r=s+5

Step-by-step explanation:

So, letsgo over what we know:

The regular price is r

The sale price is s

Now lets compare the difference between r and s:

10r = 5s

20r = 15s

30r = 25s

What is the difference between the r and s value in each situration?

Well, from what I can see, r is always 5 more than s.

This can be writen as:

r = s+5\

So this is our equation, for if you plug in any number for s, you will get an accurate r value.

For instance, if you say s is 25:

r=25+5

=

r=30

This looks just like the 30r=25s in the table above.

So:

r=s+5

Hope this helps! :)

7 0
3 years ago
Find the equation of the line that
ad-work [718]

Answer:

Step-by-step explanation:

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y - 5 = 1/2x - 2

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5 0
4 years ago
Three one thirds + two one thirds
marusya05 [52]
Here's a real answer:

Three one-thirds: 1/3 + 1/3 + 1/3 = 3/3
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3/3 + 2/3 = 5/3 = 1 2/3

Or if you mean:
3 1/3 + 2 1/3, then it is:

5 2/3

Can you give me brainliest answer?
8 0
3 years ago
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