Răspuns :
aria =π R²
a. aria = π( 8/π) ² = π · 64 : π² = 64 / π
b. aria = π·14² cm² = 196π cm²
c . aria = π · ( 1/20 )² = π / 400
a. aria = π( 8/π) ² = π · 64 : π² = 64 / π
b. aria = π·14² cm² = 196π cm²
c . aria = π · ( 1/20 )² = π / 400