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How to find a radius - Building Materials

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Half the diameter.

Posted on Nov 02, 2016


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Area of circle


(pi)R squared (Fixya won't let me use the sign for Pi)

Area of a circle=pi*radius^2 or pi times radius times radius

example: suppose the radius of a circle is 10 inches, then the Area of the circle would be pi times 10 times 10 or 100*pi

pi represents the circumference (distance around) of a circle / diameter and for any circle is constantly the same number which is approximately 3.14

so in my example 100*pi=100*3.14 or 314 square inches

Jul 03, 2014 | Computers & Internet

1 Answer

What size cone is needed to hold 150 gallons


You need a cone with a volume of 150 gallons.
The volume of a right circular cone is given by the formula
V_cone=(Area of base *height)/3
Since cone is circular , its base is a disk with a certain radius r. The formula becomes PI*(r^2)*h/3
As you see there are two variables, the radius and the height. There is an infinite number of combinations (radius, height) that will give you a total volume of 150 gallons. You can choose the radius (r) and solve for h, or you can choose the height then solve for the radius.
I suggest you convert gallons to cubic feet or to cubic meters then put
V=Pi*(r^2)*h/3 where V is the value of volume after conversion.
If you choose the radius, then to isolate h, h=(3*V)/(Pi*r^2)
If you choose the height, then to solve for r
r^2=(3V)/(Pi*h)
and r=square root of (3V/(Pi*h))
Now, it is your turn to carry out the rest of the calculation.
It will consist of the value of the radius, and the value of the height.
If the cone is not right circular, the situation becomes more complicated.

Sep 16, 2013 | Office Equipment & Supplies

1 Answer

I have a round table and I want to find out what is the Square meter on this raound table?


You have to multiply the radius by radius and multiply it to the pie.

A = Pie (Radius)x(Radius)

more on this link.

Feb 14, 2011 | Texas Instruments TI-83 Plus Calculator

1 Answer

Rick to maxtrac, is it the same a radius


Yes, if you have the 16 pin connector. (The 5-pin connector is not a compatible version.)

Feb 02, 2010 | Motorola Radio Communications

2 Answers

What is the radius of a 30'' pipe


30" diameter? Radius is 15" (half of diameter).

30" circumference (distance around) is a little more complicated...

The number pi.gif is the ratio of the circumference of a circle to the diameter. The value of pi.gif is approximately 3.14159265358979323846...The diameter of a circle is twice the radius. Given the diameter or radius of a circle, we can find the circumference. We can also find the diameter (and radius) of a circle given the circumference. The formulas for diameter and circumference of a circle are listed below. We round pi.gif to 3.14 in order to simplify our calculations. diam_formula.gif circum_formula.gif

Nov 17, 2009 | Gateway FPD1975W 19" LCD Monitor

1 Answer

A pool with a radius of 2.5 metres surrounded by a path 0.8 metres wide what is the perimetee of the pool .using the value of 3.142


Hello,
You must have been taught the relation between the circumference (perimeter) of a circle, the radius and pi. Use it to calculate the perimeter. It is true for all circular figure.
Depending on what is really asked (the perimeter of the actual pool where you find the water, or the general pool area where no shoes are allowed)
1st case: use the radius that was given.
2nd case: the total radius is the radius given plus the width of the path.

If you do not have a formula for the perimeter that involves the radius, but have one that involves the diameter you can use it too, knowing that the diameter is twice the radius or the radius is one half of the diameter.

As you might have guessed I was not going to make things too easy for you by providing a ready-made answer, but I gave you all the hints that will help you solve the problem.

Oct 11, 2009 | Mathsoft StudyWorks! Mathematics Deluxe...

2 Answers

Example of program in c++ and there code


Hello my friend, I am Jonas I work as a programmer in some various programming languages. Here try this code:
This program is design to output the Diameter, circumference, and area given a radius of a circle. #include <iostream.h> int main() { int radius, diameter, circumference, area, pi; cout << " Enter the radius of a circle\n"; cin >> radius; pi = 3.14159; diameter = 2 * radius; circumference = 2 * pi * radius; area = pi * (radius)^2; cout << "Diameter formula executing.....(2 x r)\n"; cout << "Diameter is " << diameter << endl; cout << "circumference formula executing.....(2 x pi x r)\n"; cout << "circumference is " << circumference << endl; cout << "area formula executing......(pi x [r x r])\n"; cout << "area is " << area << endl; return 0; }
Also if you need tutorial you can visit this site Learning C++ .Hope this solution will able to help your problem solved. If you need more assistance just reply to this post or send me a mail at geo_jonas@yahoo.comThank you and Godbless.

Jul 09, 2009 | Computers & Internet

1 Answer

No ip assignment with cisco 5400,radius server and isdn config


Sounds like you are missing AAA author for your PPP sessions. Without seeing your config, it is a bit hard to give you more help.

Jun 12, 2009 | Cisco Universal Access Server AS2511-RJ...

1 Answer

I am attempting to secure my network through this router which at this time is open for the whole neighborhood to see


Here are the diffenent types of Security Settings possible with a wireless router: (how to set this depends on the brand of router)

Security Mode: You may choose from Disable, WEP, WPA-Personal, WPA2-Personal, WPA-Enterprise, WPA2-Enterprise, or RADIUS. All devices on your network must use the same security mode in order to communicate.
Capture(wlansec.wpapersharekey) WPA Personal:
Capture(helpwpa.phase8) WPA Algorithm: You may choose from TKIP or AES.
Capture(helpwpa.phase9) WPA Pre-Shared Key: Choose a unique key to authenticate with other devices on your network. The Pre-Shared Key must be between 8 and 63 characters in length.
Capture(helpwpa.phase10) Group Key Renewal: This settings determines how often your group key changes.


Capture(wlansec.wpa2persharekey) WPA2 Personal:
Capture(helpwpa.phase11) WPA2 Algorithm: You may choose from AES or TKIP+AES. Choose TKIP+AES if you have both WPA and WPA2 devices on your network.
Capture(helpwpa.phase12) WPA2 Pre-Shared Key: Choose a unique key to authenticate with other devices on your network. The Pre-Shared Key must be between 8 and 63 characters in length.
Capture(helpwpa.phase13) Group Key Renewal: This settings determines how often your group key changes.


Capture(wlansec.wparadius) WPA Enterprise:
Capture(helpwpa.phase14) WPA Algorithm: You may choose from TKIP or AES.
Capture(helpwpa.phase15) RADIUS Server Address: The IP address of your RADIUS server.
Capture(helpwpa.phase16) RADIUS Server Port: The port your RADIUS server uses.
Capture(helpwpa.phase17) Shared Secret: The shared secret set on your RADIUS server.
Capture(helpwpa.phase18) Key Renewal Timeout: Determines how often your keys should be renewed.


Capture(wlansec.wpa2radius) WPA2 Enterprise:
Capture(helpwpa.phase19) WPA2 Algorithm: You may choose from AES or TKIP+AES. Choose TKIP+AES if you have both WPA and WPA2 devices on your network.
Capture(helpwpa.phase20) RADIUS Server Address: The IP address of your RADIUS server.
Capture(helpwpa.phase21) RADIUS Server Port: The port your RADIUS server uses.
Capture(helpwpa.phase22) Shared Secret: The shared secret set on your RADIUS server.
Capture(helpwpa.phase23) Key Renewal Timeout: Determines how often your keys should be renewed.


Capture(wlansec.wep) WEP:
Capture(helpwpa.phase24) Default Transmit Key: The key you would like to use for transmitting WEP keys.
Capture(helpwpa.phase25) WEP Key Bit: You may select from 64-Bit or 128-Bit encryption.
Capture(helpwpa.phase26) Passphrase: You may enter a passphrase consisting of any keyboard character to be used to generate a hex WEP key. Passphrase option is only supported when you are only using Linksys devices on your network.
Capture(helpwpa.phase27) Key 1-4: You may enter a WEP key manually. You must use only hex characters (0-9 and A-F). 64-Bit WEP requires 10 hex characters. 128-Bit WEP requires the use of 26 hex characters.


Capture(wlansec.radius) RADIUS:
Capture(helpwpa.phase28) RADIUS Server Address: The IP address of your RADIUS server.
Capture(helpwpa.phase29) RADIUS Server Port: The port your RADIUS server uses.
Capture(helpwpa.phase30) Shared Secret: The shared secret set on your RADIUS server.
Capture(helpwpa.phase31) Default Transmit Key: The key you would like to use for transmitting WEP keys.
Capture(helpwpa.phase32) WEP Key Bit: You may select from 64-Bit or 128-Bit encryption.
Capture(helpwpa.phase33) Passphrase: You may enter a passphrase consisting of any keyboard character to be used to generate a hex WEP key. Passphrase option is only supported when you are only using Linksys devices on your network.
Capture(helpwpa.phase34) Key 1-4: You may enter a WEP key manually. You must use only hex characters (0-9 and A-F). 64-Bit WEP requires 10 hex characters. 128-Bit WEP requires the use of 26 hex characters.

Jul 03, 2008 | Computers & Internet

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