Melody

921 Questions
34315 Answers

+1

1

1742

2

+118725

Mathigon website

I just discovered a site called mathigon

https://mathigon.org/dashboard
mehr ..

Melody 02.04.2022

-8

609

1

+118725

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. mehr ..

Melody 16.03.2022

-2

8

1459

5

+118725

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 mehr ..

●●●●●

Melody 15.03.2022

-3

871

3

+118725

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

Off-Topic

Melody 13.03.2022

-4

849

3

+118725

WELCOME BACK CPHILL !

Melody 11.02.2022

-5

717

2

+118725

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. mehr ..

Melody 01.02.2022

-7

889

11

+118725

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 mehr ..

●●●●●●●●●●●

Melody 09.01.2022

-6

1

996

3

+118725

HAPPY BIRTHDAY CHRIS!

Melody 20.12.2021

+5

16

5552

9

+118725

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 mehr ..

Off-Topic

●●●●●●●●●

Melody 04.11.2021

-9

1091

1

+118725

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

Off-Topic

Melody 29.10.2021

+118725

0

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.

Melody03.11.2013

+118725

0

Anything divided by itself = 1 (except 0)

Melody03.11.2013

+118725

0

890+4 3/4 = 894 3/4

Melody03.11.2013

+118725

0

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

Melody03.11.2013

+118725

0

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

Melody02.11.2013

+118725

0

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 ??

Melody02.11.2013

+118725

0

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.

Melody02.11.2013

+118725

0

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.

Melody02.11.2013

+118725

0

What is the squareroot of 12

sqr12 = sqr4 *sqr3 = 2*sqr3

Or, you can get an estimate from your calculator.

Melody02.11.2013

+118725

0

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 =

Melody02.11.2013