Question

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Answer 1

Lungime a cercului: 2πR

a) 2π3=6π cm;

b) 2π7=14π cm;

c) 2π1,2=2,4π m;

d) 2π2,1=4,2π dm.

RAZA cercului:

π×R²

a) π×3²=9π;

b) π×7²=49π;

c) π×1,2²=1,44π;

d) π×2,1²=4,41π.