Melody

921 Questions
34316 Answers

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Mathigon website

I just discovered a site called mathigon

https://mathigon.org/dashboard
lire plus ..

Melody 2 avr. 2022

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Reporting problems.

There are a number of people having problems at the moment.
If you lodge an error can you please give all relevant information that you can think of.
Where you are in the world - the city or the country - is often very important information. lire plus ..

Melody 16 mars 2022

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How to make an empty rectangle in Latex

I just worked out how to make an empty box of various horizonal size easily in LaTex.
This is not a recommended method, but other methods that I have tried here have not worked.
This coding is really simple. Just put letters inside lire plus ..

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Melody 15 mars 2022

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HAPPY ANNIVERSARY CHRIS! (CPhill)

I just realized that you became a member here exactly 8 years ago today!

It has been great to have you here all that time

Hors sujet

Melody 13 mars 2022

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WELCOME BACK CPHILL !

Melody 11 févr. 2022

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Very interesting question. No high level maths required.

This question was posted a couple of days ago.
https://web2.0calc.com/questions/geometry_73561

I think it is really interesting. It looks much more difficult than it really needs to be. lire plus ..

Melody 1 févr. 2022

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Members have a better experience. Their questions get more attention.

Almost everyone is posting as a guest.
If you post as a member your questions will have a far greater chance of a timely and helpful response.
If you are a genuine learner and interact with us, you will become known and answerers will do lire plus ..

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Melody 9 janv. 2022

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HAPPY BIRTHDAY CHRIS!

Melody 20 déc. 2021

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Some guidelines for question askers.

Please note:
1) Ask only one question per post.
2) When asking a question talk about what you have tried for yourself. Then people will take you more seriously and will be more able and willing to help.
3) If you get an answer lire plus ..

Hors sujet

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Melody 4 nov. 2021

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Remeniscing - a little historical humour.

I just found this old post that some of you, who have been around for a while, might find amusing.

https://web2.0calc.com/questions/look-at-the-new-leader-board

Hors sujet

Melody 29 oct. 2021

+118730

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A circle has a diameter of 20 cm.
The line AC is a diameter of the circle.
B is a point on the circumference of the circle with AB = 12 cm. The point D lies on the arc AC on the opposite side to point B.
What is the sine of ∠BDC?

<BDC=<BAC they are both subtended from arc BC so they are congruent

<ABC = 90degress (angle in a semicircle)

Cos(<BAC) = 12/20

and you can finish it.

Melody3 nov. 2013

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Anything divided by itself = 1 (except 0)

Melody3 nov. 2013

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890+4 3/4 = 894 3/4

Melody3 nov. 2013

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Not to worry, I make embarassing mistakes all the time.

Melody3 nov. 2013

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What are the dimensions of a prism that has a volume of 216mm3 but is not a rectangular prisim

As you are probably aware, there are many answers to this problem.

It could be a triangular prism where : 1/2 * base * height * length = 216
OR
It could be a cylinder where : pi * r^2 * height = 216
Or
any other shape prism where 216 = area of front face * depth

Melody2 nov. 2013

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Just remember that multiply and divide are done before plus or minus

7 - 4 + 3 x 0 + 1

= 7 - 4 + (3 x 0) + 1

=7 - 4 + 0 + 1

= 4

How did you get 2 ??

Melody2 nov. 2013

+118730

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1) -6 - -5 - 8 =
2) -5 x -6 x -2 =
3) 8 divided by -4 x -5=

http://www.youtube.com/watch?v=d8lP5tR2R3Q

There is one clip for adding and subtracting
and
another for multiplying

see if these help you.

Melody2 nov. 2013

+118730

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First simplify both sides separately. Which means expand the bracket and collect like terms.
If you have a go at this and don't know what to do next then you can post again.

Melody2 nov. 2013

+118730

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What is the squareroot of 12

sqr12 = sqr4 *sqr3 = 2*sqr3

Or, you can get an estimate from your calculator.

Melody2 nov. 2013

+118730

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Pour la physique j'ai à résoudre se calcul : 2.657x10^(-26)/1.673x10^(-27) et je trouve la bonne reponce mais avec a peu près 52 zeros donc je ne trouve pas comment simplifier pourriez vous m'aidez ?
merci

For physics I have to solve is calculation: 2.657x10^(-26)/1.673x10^(-27) and I find the good answer but with about 52 zeros so I can not find how to simplify pourriez you help me?
Thank you

2.657x10^(-26)/1.673x10^(-27) = (2.657 / 1.673 ) * 10^(-26 - - 27) = 1.588 * 10^1 = 15.88 ( to 3 significant figures ) (à trois chiffres significatifs)

OR you could just do the whole lot on your calculator
OU vous pourriez juste faire le tas sur votre calculatrice

2.657 EXP -26 / 1.673 EXP -27 =

Melody2 nov. 2013