A circle has a radius of 4.5 inches. If the radius of the circle is doubled, does the area of the circle double as well

Volumes are any three dimensional measurement...

I Seriously doubt that I could get Pi ("pie") to print...
But I'll just GIVE YOU the number (much simpler)
Pi = 3.14159

Inches, feet, yards or meters.. all the dimensions need to be in the same values... So if you have an inch "ruler"...
That is just fine...!!

Your first step would be to determine the diameter of the inside of your cylinder in inches...
CONVERT that to the RADIUS by DIVIDING by 2...
Multiply that RADIUS by itself and then by 3.1416 = area of circle in INCHES... (radius "squared" x Pi = (square inched)

Then MULTIPLY the height (in inched) by the AREA...
EQUALS THE VOLUME in CUBIC INCHES...!!



But I'll just GIVE YOU a REFERENCE (much simpler)
mathematical constant ?
Area of circle

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 figures.in the relevant formula.

Just a little over 53.3 gallons

Answer is A. Divide area by pi to find the circumference. (153.86/3.14 = 49) Determine the square root of the circumference to find the radius. (sqrt of 49 = 7)

(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

a. radius is 7 inches and circumference is 43.96 inches.

NO.

About 146 and a half degrees.

If this is homework, be sure to show your work.

This must be the area of a circle with a radius of 4 in.. The formula for this is Pi (3.14) X radius X radius.
3.14 X 4in X 4in = 50.24 inches squared

The Circle Class Using Data Hiding and Encapsulation package shapes; // Specify a package for the class public class Circle { // The class is still public // This is a generally useful constant, so we keep it public public static final double PI = 3.14159; protected double r; // Radius is hidden, but visible to subclasses // A method to enforce the restriction on the radius // This is an implementation detail that may be of interest to subclasses protected checkRadius(double radius) { if (radius < 0.0) throw new IllegalArgumentException("radius may not be negative."); } // The constructor method public Circle(double r) { checkRadius(r); this.r = r; } // Public data accessor methods public double getRadius() { return r; }; public void setRadius(double r) { checkRadius(r); this.r = r; } // Methods to operate on the instance field public double area() { return PI * r * r; } public double circumference() { return 2 * PI * r; } }