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circumference is pye times twice the radius or by the diameter
3.1417 X 6 ( diameter or 2 times the radius )= 18.8496
90 degrees is 1/4 of the circumference
18.8496 divided by 4 = 4.7124 cms
arc of 90 degrees =4.74124 cms
Circumference of a Circle: 2 x pi x radius - OR - pi x diameter,
or if you need some sphere calculations?
Sphere Surface Area: 4 X pi X radius squared OR
pi X diameter squared
Sphere Volume: 4/3 X pi X radius cubed OR
( pi X diameter cubed ) / 6
By the way.......... "pi" = 3.1415926536
what class are you in? Is this your home work?
Anyway, You should know that
Circumference = 2 x pie x radius
therefore radius - circumference / 2 x pie
in this case
radius = 30 x 7 / 2 x 22
= 210 / 44
Now you can calculate that fraction.
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.
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 [email protected] you and Godbless.
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