Melody

Hint:

Let distance AB be    x+3

Now work out an expression for the shaded region in terms of x and put it equal to 51

Solve for x

Now find the whole area.

Wie viele Kugel sind im Würfel?

How did you arrive at this answer Hannah?

I do not understand your working either guest.  What is CRT + MMI  ?

If order counts     13P5

If order doesn't count  13C5 

Please include the address of the original.    AND   Ask people to post on the original.

\(4x^3*1*1=4x^3\\ 4*x^2*3*x=12x^3\\ 4C3*x*x*x=4x^3\\ total\\ 20x^3\)

I get 20

I didn't say anything about how many questions you can answer.

I said " please limit your social posts to maybe one a day. "

I am not trying to dampen your enthusiasm altogether.  

Thanks Alan, that is better :)

draw a triangle on a piece of paper and then cut it out.

Label the angles a, b and c   Write the letters in the corners.

Now tear the corners off and put them next to each other and you will see that they line up to a straight line

a+b+c=180 degrees  (a straight angle)

It is annoying that you post 2 questions on one post. 

That is one reason why I would almost never answer you.