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2 years ago

Help?

Mathematics

2 answers:

TEA [102]2 years ago

5 0

Given circumference formula for circle C = 2pir.

The question is asking to solve for pi or make pi as the subject.

With pi we have 2 r multiplied.We always perform the opposite operation both sides.Opposite of multiplication is division so we divide both sides by 2r

Dividing both sides by 2r we have:

$\frac{c}{2r} =pi(\pi )$

Among all the options pi equals C over quantity 2 times r is the right answer.

devlian [24]2 years ago

4 0

To solve for Pi do the following:

C = 2Pi • r
C/2r = Pi

The solution would be Pi equals C over quantity 2 times r.

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A rectangular pool is to be built on a lot that measures 20 m by 12 m. A wooden deck of uniform width, equal to the area of the

frutty [35]

The length and breadth(width) of the pool are

$l\approx15.7m\text{ and }b\approx7.7m$

Let

$l=\text{length of the side of the pool}\\b=\text{breadth of the pool side}\\w=\text{the width of the strip of deck surrounding the pool}$

From the question, we can build the following relationships

$l+2w=20\\b+2w=12$

subtracting to eliminate $w$ (we do not even need it!)

$l-b=8\\b=l-8$

we can also build another relationship from the question. Since the area of the strip equals the area of the pool:

$lb+lb=2lb=20\times 12\\lb=120$

We have two unknowns, $l$ and $b$ . Eliminate $b$

$lb=120\\l(l-8)=120\\l^2-8l-120=0$

If we solve the quadratic equation for $l$ , we get

$l=4+2\sqrt{34}\approx 15.7m$

and

$b=l-8\\b=(4+2\sqrt{34})-8\\b=2\sqrt{34}-4\approx7.7m$

The length and breadth(width) of the pool are

$l\approx15.7m\text{ and }b\approx7.7m$

Learn more about area here: brainly.com/question/1447350

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2 years ago

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Anettt [7]

Answer:

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Step-by-step explanation:

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Anarel [89]

Answer:

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Step-by-step explanation:

Let :-

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As we know :-

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So that ,

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makvit [3.9K]

Answer:

Step-by-step explanation:

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so,

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