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2 years ago

Which rotation about its center will carry a regular decagon onto itself?

Mathematics

1 answer:

il63 [147K]2 years ago

8 0

Answer:

D.252

Step-by-step explanation:

In this question, We have to find which rotation about its center will carry a regular decagon onto itself?

A decagon : 10 sided polygon

As we know, a full rotation can be 360°.

For a decagon: 360/10 =36

For a decagon, any multiple of 36 can map onto itself.

In our options only 252 is the multiple of 36.

So, correct answer is option D 252

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The given right rectangular prism is composed of small cubes. Find the following is the volume of the prism and the volume of on

valina [46]

Answer:

The big prism= $\frac{25}{18}$ feet squared

Each individual cube= 216 inches squared

Step-by-step explanation:

The big prism LxWxH

The individual cube = 1 foot/6 (amount of edges made of small cubes) = 2 inches.

IDK how to convert from inches to feet though cause I ain't American. Sorry.

Hope that helped!!! k

5 0

3 years ago

What is the radius of a sphere if its surface area is 2,122.64 square inches? (Use 3.14 for π.) 11 in. 13 in. 121 in. 169 in.

crimeas [40]

To solve this, we are going to use the surface are of a sphere formula: $A=4 \pi r^2$
where
$A$ is the surface area of the sphere
$r$ is the radius of the sphere

We know for our problem that $A=2122.64$ and $\pi =3.14$ , so lets replace those vales in our formula:
$A=4 \pi r^2$
$2122.64=4(3.14)r^2$
$2122.64=12.56r^2$
Now, we just need to solve our equation for $r$ :
$\frac{2122.64}{12.56} =r^2$
$r^2=\frac{2122.64}{12.56}$
$r^2=169$
$r=+or- \sqrt{169}$
$r=13$ or $r=13$
Since the radius of a sphere cannot be a negative number, $r=13$ .

We can conclude that the radius of a sphere with surface area <span>2,122.64 </span> $in^2$ is 13 in.

3 0

2 years ago

A. 40, B.80, C.120, D. 160, or E. 400

Rudik [331]

B: 80

All the sides add up to 20 so adding all four sides make 80

6 0

2 years ago

Read 2 more answers

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max2010maxim [7]

Answer:

Step-by-step explanation:

you're using the pythagorean theorem

8 0

2 years ago

Tricio mokes $9.00 an hour and works 40 hours a week. How much money does she earn in a year

nadezda [96]

Answer:

18,771 $

Step-by-step explanation:

there are 52.1429 weeks in one year with 40 hours of work each week and then 9 dollars made an hour this equals to 18,771 $

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2 years ago