Special Edition - KCC's Quiz - World Engineering Day Quiz - What's the area of the ring?

No trap here, answer is easy to find!

We have :  \text{Aring}=\pi\times(R^2-r^2)

Since the length of the half string is 1 meter, we have:

1+r^2=R^2

Therefore :

A\text{ring=\textbackslash pi}

Right MikeLh , congrats!

Ring area is PI ~ 3.14...

r^2 + 1 = R^2 -> R^2 - r^2 = 1
Aring = PI*R^2 - PI*r^2 = PI * (R^2 - r^2) = PI

1 . From Pitagora R^2 - r^2 = 1. The area is pi*(R^2 - r^2)=pi

Yes, you get it AlexTru , the area is simply Pi.... Amazing isn't it?

Bingo Celin , you found it, congratulations!

Pi

Pi

Bingo bradstev22 , you get it!