What % of a 10" pastry case is a 7" pastry case?

[ringo]

Here, have some pie, it'll make you feel better.

It's got cocaine in it

Finely ground or granular?

 

[cesare]

Oh dear this isn't an obscure joke about Pie r squared is it?

 

[bigbry]

Nope, if the case was square that would be the case but circles are different.

Would still be 49% if tins were square - 'tis to do with the square of the dimension (7x7=49, 10x10=100)

(Edited to add:- Sorry hadn't seen Prunus reply when I posted this)

 

[kabbes]

Imagine a floor tile that measures 1ft by 1ft.

How many tiles do you need to fill a 1 ft by 1ft square?

 -
| |
 -

How many do you need to fill a 2ft by 2ft square?

 - -
| | |
 - -
| | |
 - -

Why is the second number so much bigger than the first, even though 2ft is only twice as much as 1ft?

How many tiles do you need to fill a 3ft by 3ft area? Why is this so much bigger than the 2ft by 2ft, even though 3ft is only 50% more than 2ft?

Now consider a 10ft by 10ft area versus a 7ft by 7ft area.