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What is the area, and its approximate uncertainty, of a circle of radius 3.8x104 cm?

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  • Vishal Verma Sep 12, 2010

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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

2 Answers

15" circle what is outside measurement


If you would like to know the circumference of a 15" diameter circle this is the formula:
circumference = radius x 2 x pi
circumference = diameter x pi

in our case:
circumference = 15" x 3,14
circumference = 47 ,1" (that's 119,634 cm)

May 06, 2014 | Cars & Trucks

1 Answer

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


Try it. Area is equal to pi (3.1417) multiplied by the square of the radius.

At 4.5 in. A=63.585 sq in
At 9 in. A=254.34 sq in
What do you think?

Mar 13, 2014 | Computers & Internet

2 Answers

What is the pi button


Pi is a mathematical constant whose value is the ratio of any Euclidean plane circle's circumference to its diameter; this is the same value as the ratio of a circle's area to the square of its radius. It is approximately equal to 3.14159265 in the usual decimal notation.

Mar 05, 2011 | Casio FX82MS Scientific Calculator

1 Answer

If you know about area formulas of class 8 and 9,please solve my question?there is a circle.in the between of the circle,there is a rectangle of dimension 4cm and 3cm.if the rectangle will cut out what...


The diameter of the circle is the diagonal of the rectangle use Pythagoras this rectangle is a made from two 3,4,5 triangles, so the diameter is 5cm, the radius will be 2.5cm don't forget the BODMAS ordering rule (Brackets of Division Multiplication Addition and Subtraction) Also rounding to 2 decimal places. This solution is based on all four corners of the rectangle touching the circumference of the circle.

Area of a circle is P (22/7) i x Radius (squared ^2) ====> 22/7 x 2.5cm ^ 2 ====> 22/7 x 6.25cm

TOTAL AREA of CIRCLE = 19.64 cm^2

Area of the rectangle is length x width ====> 4 cm x 3 cm

TOTAL AREA of RECTANGLE = 12 cm ^2

The remaining portion is the circle area minus the rectangle 19.64-12 = 7.64 cm^2


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Jan 31, 2011 | Computers & Internet

1 Answer

Three circles of radius 3.5 cm are placed in such a way that each circle touch as the other two the area of the portion enclosed by the circle is????? A)1.967cm2 B)1.975cm2 C)19.67cm2 D)21.21cm2


There is no single, correct, answer to this question.
For example, if the three circles overlap 99%,
then the combined area will only be about 1% larger
than the area of a single circle.

If the circles only slightly overlap, then the combined area will be much larger than the area of one circle.

Sep 03, 2010 | Computers & Internet

1 Answer

How to calculate surface area using a casio fx -83 ES


You sort out the formula for the surface you have to calculate then substitute the numerical values for the variables (sides, bases, heights), the constants if any (pi, etc.) an press = to get the result
Ex Square with side= 2m
Surface area=side^2
Area : 2 [X^2][=] result is 4 m^2
Circle of radius r=3 cm
Area: Pi* 3[^2]=28.27 cm^2

May 12, 2010 | Casio FX-115ES Scientific Calculator

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

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