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sergij07 [2.7K]
2 years ago
8

Which of the following is a rational number? 8 15 44 45 π

Mathematics
2 answers:
Nady [450]2 years ago
6 0
All of them except pi. All of the other numbers can be written as fractions, (8/1),(15/1)(44/1) etc.
sveta [45]2 years ago
4 0

All of them are, except ' π ' (pi) ... which gives you an idea of why
that one is usually written as a symbol and not as digits.

Here's a useful factoid regarding the other numbers on the list:
-- <em>ANY</em> number that you can write down on paper, <u>completely</u>,
using digits, is a rational number.


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A community pool that is shaped like a regular pentagon needs a new cover for the winter months. The radius of the pool is 20.10
boyakko [2]

Answer:

960.42\text{ ft}^2

Step-by-step explanation:

Please find the attachment.  

We have been given that a community pool that is shaped like a regular pentagon needs a new cover for the winter months.

To find the area of community pool we will use area of pentagon formula.

\text{Area of pentagon}=\frac{1}{2}a*p, where, a represents the apothem or perpendicular distance from the center of the pentagon and p represents perimeter of pentagon.

Let us find the perimeter of our given pentagon by multiplying each side length by 5.

\text{Perimeter of community pool}=5\times 23.62

\text{Perimeter of community pool}=118.1

Now let us find apothem of our pentagon by using Pythagoras theorem.  

a^2=20.10^2-11.81^2

a^2=404.01-139.4761

a^2=264.5339

a=\sqrt{264.5339}

a=16.2645

Upon substituting our given values in above formula we will get,

\text{Area of community pool}=\frac{1}{2}\times 16.2645\times 118.1

\text{Area of community pool}=8.13224907\times 118.1

\text{Area of community pool}=960.418615627971\approx 960.42

Therefore, the area of the pool that needs to be covered is 960.42 square feet.

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Answer:

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<h2>d. 1 is the right answer.</h2>
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