Explicație pas cu pas:
Salutare!
[tex] \color{red}\boxed{\boxed{\bf \:lungimea \: cercului = 2\cdot\pi \cdot r}}[/tex]
[tex]\bf 2\cdot\pi \cdot r= 10 \cdot\pi\: \: \bigg|: 2 \pi \implies \boxed{ \boxed{ \bf r = 5}}[/tex]
[tex]\bf 2\cdot\pi \cdot r = 8 \cdot\pi \cdot \sqrt{2}\: \: \bigg|: 2 \pi \implies \boxed{ \boxed{ \bf r = 4 \sqrt{2}}}[/tex]
[tex]\bf 2\cdot\pi \cdot r =2 \cdot \pi \cdot \sqrt{5}\: \: \bigg|: 2 \pi \implies \boxed{ \boxed{ \bf r = \sqrt{5}}}[/tex]
[tex]\bf 2\cdot\pi \cdot r = 5 \cdot\pi \: \: \bigg|: \pi \implies 2 \cdot r = 5 \implies \boxed{ \boxed{ \bf r = \dfrac{5}{2}}}[/tex]
==pav38==
