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Math What is the formula of radius?

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Circumference divided by 2 times Pi

Posted on Jan 10, 2008


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Posted on Jan 02, 2017


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What is the cubic yard of a circle that is 10.82feet diameter x 16inches deep?

the formula for volume of a cylinder is Volume = pi × r2 × h
but if you arent math savvy, first you convert your units so they are the same. all you have to do is change 16 inches into 1.3 feet and divide your diameter (10.82 feet) by 2 to give you the radius (5.41 feet)
plug in those values here:

and you will get 119.5 cubic feet

then convert cubic feet to cubic yards here:

and the answer to your question is 4.425 cubic yards

Apr 26, 2017 | The Office Equipment & Supplies

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I need the formula for figuring cubic yards. for example i have a 100 diameter @ 30 deep. What is the formula to figure my cubic yards


Where ?=3.14

r^2 is radius square. You have 100 diameter. So 50 is the radius. 50^2=2500

h is height or your depth. When you do your calculations make sure all your measurements are in yards. Meaning radius in yards and depth in yards.

Apr 18, 2017 | The Office Equipment & Supplies

1 Answer

What is the weight of the liquid paraffin in a cylindrical can of 5cm diameter and 150mm height

Come on, where's your school boy maths? Formula is Pi R Squared x Height. Therefore 3.142 x 2.5cm(radius) squared x 15cm = 294.56 cubic centimetres, call it 295.
Water weighs 1kilo at 1 litre so approx 295cc's will be 295 grams, if thats any help? If not substitute the true weight per mL or cc of paraffin because there are various grades of paraffin If you do it in old imperial, 1 english gallon of water is 10 lbs.

Apr 08, 2017 | Cars & Trucks

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Model LAT8740AAW. How can I determine the cubic feet?

I can tell you that is holds 19 gallons for a full load. If you are good at math here is a formula to figure it out.
Volume (cu. ft.) = pi times r times r times D
pi = ~3.14
r = radius (feet); remember r = diameter divided by 2

Mar 28, 2016 | Maytag Washing Machines

1 Answer

What is the area of a circle if the circumference is 2 pi inches

area formula is PI x r squared
that is 3.1417 times the radius of the circle squared
example is:- 3.1417 times 3 inches squared =3.1417 times 3x3=3.1417x9=28.279 square inches if you want to work back from a circumference measurement, the formula for circumference is 2 x PI x radius or PI x diameter
if you have a circumference of 12 inches then the dia is calculated 12 inches = dia x PI to get the diameter , divide the 12 inches by PI and that will be the diameter so that is 12 divided by 3.1417 =3.819 inches
now you can go from the first formula the radius is the diameter divided by 2 so the radius will be 3.819 divided by 2 = 1.909 inches
so applying the area formula it becomes 3.1417 times 1.909 times 1.909 =11.458 square inches
to find your answer simply substitute the dimensions in place of the example the relevant formula.

Aug 24, 2015 | Office Equipment & Supplies

1 Answer

Volume of a cylinder formula

Volume of a right circular cylinder of radius r and height h is
Figure out which is the radius and which is the height, then plug in the formula above. Result is in cm^3

Jun 26, 2014 | Office Equipment & Supplies

1 Answer

Find the equations of circles passing through (1,-1),touching the lines 4x+3y+5=0 and 3x-4y-10=0

First, I graphed the lines and the point using

I noticed that the two lines are perpendicular to each other and the point (1,-1) appears to be on the right side of the circle, on a line parallel to 3x -4y-10=0. The equation of this line is y= 3/4x - 1.75. The y-intercept is -1.75. Now we have two points on the opposite sides of the circle, (1, -1) and (0,-1.75). The midpoint formula will give you the centre of the circle and the distance formula will provide the radius.

Let me know if you have any questions.

Good luck.

Desmos Beautiful Free Math

Jun 09, 2014 | Office Equipment & Supplies

1 Answer

Hexagon calculator

I will not try to guess what that diameter represents, so I will give you all mensuration formulas for the area of a regular polygon.
s is the measure of the side, r the radius of the inscribed circle, R the radius of the circumscribed circle, and n the number of sides.
If the angle unit in your calculator is the degree, use 180 instead of Pi. Use the formulas with PI if angle unit is set to radians.
In the formulas on the last line of the display screen (the formulas with sine functions) the radius r should be R (circumscribed circle radius). cot is the reciprocal of the tangent function (cot(x)=1/tan(x) )


Apr 14, 2014 | Office Equipment & Supplies

1 Answer

Troubleshooting Plumbing

The psi is obtained by a maths formula. Surface area x height by atmospheric pressure ( That is 3.1416x radius squared x height x 14.7lbsSQ") Do the calculations on the first height then repeat the exercise for the new height and that is the increase you will get in pressure.

Apr 27, 2013 | Cars & Trucks

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

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