Question about The Learning Company Achieve! Math & Science Grades 1-3 (381933) for PC, Mac

Maths

I'm not sure what your ellipse looks like but the equation for the area of an ellipse is given by:

pi times the long axis times the short axis

pi = 3.1416

The length of the long axis is from the center of the ellipse to the outer edge of the ellipse

The length of the short axis is from the center of the ellipse to the outer edge of the ellipse

Hope this helps Loringh

Posted on Nov 02, 2008

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Posted on Jan 02, 2017

It varies by the shape. Anything sort of circular usually involves equations with Pi, but objects with corners are different. Since Fixya will not allow me to type equations very well here, I'll refer you to

http://www.cliffsnotes.com/math/geometry/perimeter-and-area/formulas-perimeter-circumference-area

http://www.coolmath.com/reference/perimeters.html

http://www.mathsisfun.com/geometry/ellipse-perimeter.html

http://math2.org/math/geometry/areasvols.htm

http://www.cliffsnotes.com/math/geometry/perimeter-and-area/formulas-perimeter-circumference-area

http://www.coolmath.com/reference/perimeters.html

http://www.mathsisfun.com/geometry/ellipse-perimeter.html

http://math2.org/math/geometry/areasvols.htm

Oct 12, 2014 | Mathsoft StudyWorks! Middle School Deluxe...

Since the area of a whole circle is pi times the radius squared, the area of half the circle is one half times pi times the radius squared.

Apr 30, 2014 | Computers & Internet

The circumference of a circle is given by the expression

Circumference= 2* PI* Radius of circle

**C=2*Pi*R**

The area is given by

**Area of a disk with radius R** **= Pi* R*R** or **PI*R^2**

**Area= PI*R^2**

Circumference= 2* PI* Radius of circle

The area is given by

Mar 11, 2014 | SoftMath Algebrator - Algebra Homework...

The area of a circle is pi * r^^2.

For the first pond, the area is pi *14^^2. Let's say that is A

For the second pond the area is pi * r^^2. Let's say that is a.

But a = A/4 or, conversely 4a = A.

But A = pi*14^^2 = 4a = 4(pi * r^^2) or

pi*14^^2 = 4(pi*r^^2) or

pi*14^^2 = 4pi*r^^2 or

14^^2 = 4*r^^2

196 = 4*r^^2

196/4 = r^^2

49=r^^2

7=r

So a pond of radius 7m has an area a quarter of a circular pond of 14m.

For the first pond, the area is pi *14^^2. Let's say that is A

For the second pond the area is pi * r^^2. Let's say that is a.

But a = A/4 or, conversely 4a = A.

But A = pi*14^^2 = 4a = 4(pi * r^^2) or

pi*14^^2 = 4(pi*r^^2) or

pi*14^^2 = 4pi*r^^2 or

14^^2 = 4*r^^2

196 = 4*r^^2

196/4 = r^^2

49=r^^2

7=r

So a pond of radius 7m has an area a quarter of a circular pond of 14m.

Jan 26, 2014 | Mathsoft Computers & Internet

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

3.14 X 4in X 4in = 50.24 inches squared

Jan 28, 2010 | Mathsoft StudyWorks! Mathematics Deluxe...

The volume of a tube is the area of the base times the height.

In your case you were given the diameter of the tube.

D = 172mm

I converted this to meters right away so that the units are the same.

The area of a circle is pi x (radius)^2

Divide the diameter by 2 to get the radius.

R = .086m

Pi = 3.14159....

The area of the base of your tube is pi x (.086)^2

A = 0.023 m^2

To find the volume of the entire tube, multiply the height by the area.

V = H x A

V = 7.5m x 0.023m^2

V=0.174 m^3

In your case you were given the diameter of the tube.

D = 172mm

I converted this to meters right away so that the units are the same.

The area of a circle is pi x (radius)^2

Divide the diameter by 2 to get the radius.

R = .086m

Pi = 3.14159....

The area of the base of your tube is pi x (.086)^2

A = 0.023 m^2

To find the volume of the entire tube, multiply the height by the area.

V = H x A

V = 7.5m x 0.023m^2

V=0.174 m^3

Oct 13, 2009 | The Learning Company Achieve! Math &...

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**.

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)

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

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

find the volume of the largest cylinder with circular base that can be incribed in a cube whose volume is 27cu.in?

Mar 18, 2009 | Computers & Internet

Hello,

Sorry to say it but the question does not make sense. A circle is a figure that is perfectly defined by the knowledge of its center (or centre depending of the English you use) and its radius.

An ellipse is perfectly defined if you know its two foci (plural of focus) and the length each of its two axes (major and minor).

Is it the perimeter, the area, the parameter p of the ellipse you are lookong for.

Hope it will help you focus on your real the question.(The pun is intended)

Sorry to say it but the question does not make sense. A circle is a figure that is perfectly defined by the knowledge of its center (or centre depending of the English you use) and its radius.

An ellipse is perfectly defined if you know its two foci (plural of focus) and the length each of its two axes (major and minor).

Is it the perimeter, the area, the parameter p of the ellipse you are lookong for.

Hope it will help you focus on your real the question.(The pun is intended)

Feb 19, 2009 | The Learning Company Achieve! Math &...

You cannot have a semicircle that has a diameter of 2.500 mm and a radius of .425mm and a circumference of 3000mm

Circumference is equal to pi times the diameter. pi is = 3.14

The radius of a circle is always 1/2 the diameter

Area of a circle is pi time the radius squared

Loringh

Circumference is equal to pi times the diameter. pi is = 3.14

The radius of a circle is always 1/2 the diameter

Area of a circle is pi time the radius squared

Loringh

Oct 30, 2008 | The Learning Company Achieve! Math &...

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the answer to my problem (whats the area of an ellipse part circle with a long axis of 2.500mm and radius is .425) is the area is 0.835 but how have i achieved this.

You will never know how relieved I am and how helpfull your explination of the equation has been, as I have now realised where I went wrong and came to think the answer was .834 I have ended up with a 1/4 section of the Ellipse when the true area of the problem is double that. 3.1416 x 2.500 x .425 :- 2 = 1.66 not 3.1416 x 2.500 x .425 ;- 4 = .834 This might seem trivial to most but i needed to find the area of this as its the measurement of a bay window floor and needed the accurate measure, once again thank you very much, your on my christmass card list. cheers

Need more details. finish your description of your situation

Loringh

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