Question

o bara impartita la 4 egala cu cati cm?

Answer 1

Are un sfert sau 1/4 din lungimea initiala. 

Answer 2

O bara = Cerc
$r^{2}$⇒4×$r^{2}$
Aria=π×$r^{2}$
⇒4×π×$r^{2}$=
$r^{2}$=4×π
r=$\sqrt{4* \pi }$
r=2π
r=2*3,14⇒r=6,28 cm