Vaaaaa rogggggggg!!!!!

Vaaaaa Rogggggggg class=

Răspuns :

a) A=πR²

A=π×5²

A=25π m²

b) L=2πR

L=2×π×5

L=10π m

c) d=l√2

2√2=l√2

l=2√2/√2

l=2 m

d) A=l²

A=2²

A=4 m²