Question

VA ROG FRUMOS AJUTOOOOR!!!​

Answer 1

Răspuns:

Explicație pas cu pas:

1 A=πR²

a)  A=25π cm²

b) A=π·4·3=12π cm²

c)A=π·1,2²=1,44π cm²

d)A=π·9/2=4,5π cm²

2. L=2πR    R=L/2π

a) R=10π/2π=5 cm

b) R=8π√2/2π=4√2 cm

c) R=2π√5/2π=√5 cm

d) R=5π/2π=2,5 cm