Question

caLculati lungimea cercului cu raza de 2 intreg 1 supra lui 4 m

Answer 1

$R=2\frac{1}{4}=\frac{4*2+1}{4}=\frac{9}{4}\\ \Rightarrow\;\;L_{cerrc}=2\cdot\pi\cdot\frac{9}{4}=\frac{9}{2}\pi=4,5\pi\;(m)$