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tatiyna
3 years ago
13

An Octagon has the radius of 56 and an area of 10,391.9 square millimeters.

Mathematics
2 answers:
Inessa [10]3 years ago
8 0

Answer:

Step-by-step explanation:

Alright, lets get started.

The area of octagon is given = 10391.9

The formula for area of octagon with side a is = 2(1+\sqrt{2} )a^2

10391.9 = 2(1+\sqrt{2} )a^2

hence ,

a^2 = \frac{10391.9}{2(1+\sqrt{2} )}

a^2 = 2152.2329

a = 46.39

Hence the length of the side of the octagon is 46    :   Answer

Now perimeter of the octagon will be = 8*side length

Hence the perimeter = 8*46.39 =371.1

hence the perimeter of the octagon is 371   :   Answer

Hope it will help :)

solmaris [256]3 years ago
5 0
A.371
b.46 
i just took the test or assignment
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Greg studied for 12 minutes. This is 40% of the time he wants to study today. How many more minutes does Greg need to study toda
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Answer:

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Step-by-step explanation:

Hi,

I think I can help.

What I would first do here is try to find the value of 10% relative to the 12 minutes. If we find what 10% is we can multiply that to get 100% to find the total amount of minutes he wants to study. We can then subtract the time already studied to find our answer.

To do this we want to take the 40% we have and find 10. We can do 40/4 to find this since 40 divided by 4 is actually 10.

But if we do this we also have to do with to the number it is relating to / representing. Which is 12. (12 minutes = 40%)

So we can do :

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So with this we can conclude that 10% of his total time is 3 minutes.

Now lets multiply this by 10 to get the 100% we are looking for so we can get the total amount of time he spent studying.

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We can now simply take the total time and take off the time spent already to find this answer :

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I hope this helps!

If you have any questions or concerns please comment or message me! :)

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